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| Registros recuperados: 119 | |
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| Beets, C.. |
| Material: one well-preserved entire shell and another one, of which the ventral valve was destroyed for the greater part for the sake of chemical analysis in the „Rijkswegenbouw-Laboratorium”. Dimensions: the ventral valve of the holotype (fig. 9) has a length of 48.2 mm from the posterior or cardinal to the anterior border; the dorsal valve (fig. 8) is 45.2 mm long. The dorsal valve of the paratype (fig. 16) has a length of 53.8 mm. The breadth of the type is 49 mm, the thickness 32.6 mm. The habitus is more rhynchonelloid than terebratuloid, as e. g. in Gryphus Cubensis (Pourtalès) or Abyssothyris Thomson, 1927, or in some cretaceous groups (cf. Sahni, 1925). The shell is exactly bilaterally symmetrical, the ventral (pedicle-) valve being somewhat larger... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/505606 |
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| Jong, C. de. |
| When rearranging a part of the collections of Orthoptera in the Rijksmuseum van Natuurlijke Historie at Leiden I found a number of specimens belonging to this tribus, which by former authors is considered as a separate subfamily with the name Eumegalodontinae (Kirby, 1906, p. 289; Caudell, 1927, p. 30). With Karny I think it justified to let it retain its place as a tribe of the Copiphorinae. The representatives of this group are of such a remarkable shape that they can easily be recognized among the other Copiphorinae by their relatively big head and strangely shaped prothorax, which bears strongly spined lateral processes on the disc. The species under consideration can be divided into two groups, in the one of these the specimens possess a number of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.83. |
| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/319358 |
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| Kuenen, Ph.H.. |
| As early as 1863 Sorby proved that pitted pebbles are the result of solution at the points of mutual contact in a conglomerate. As cause he suggested solution under pressure in saturated, stagnant groundwater by what has afterwards been designated Riecke’s principle. By the examination of polished cuts through a pitted conglomerate I found confirmation of this hypothesis. The alternate explanation by Daubrée, Kumm and others of solution in water held by capillarity at the points of contact could not cause the observed shapes of the pits. The experiments they used to disprove Sorby’s view are fundamentally incorrect. They attempted to form pits by a solvent liquid, instead of using pressure and saturated water. Groningen, November 1942. |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/505905 |
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| Beaufort, L.F. de. |
| It needs an explanation why among the botanical papers published in this volume to honour Mrs. Weber—van Bosse on her 90th birthday a zoological contribution has been inserted. Those who have read the curriculum vitae of this wellknown botanist in the foregoing pages of this volume will not wonder, for they know that she has been keenly interested for more than half a century in the zoological work of her late husband. And so among the chorus of botanists the voice of a zoologist could hardly be missed. For many years I have enjoyed the friendship of both, and I am grateful for this opportunity to show Mrs. Weber my affection and my admiration. When contemplating an adequate theme for this paper it occurred to me that in some way or other it had to dwell... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/526387 |
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| Brieger,F. G.; Gurgel,J. T. A.. |
| The occurrence of polyembryonic seeds in Mangifera indica has been known for a long time, but nothing is known with reference to the forms cultivated in Brazil. It was found impossible to count the number of embryos in the seed, in spite of the size of both seed and embryo. But the cotyledons are in such a way twisted around each other that it is impossible to separate them. Thus it was necessary to take into acount only the embryos which were able to germinate and their number was determined after 3 and 7 months. It was necessary to dig up the seedlings and wash off all soil in order to distinguish ramifications of shoot and root from the actual polyembryony. In 7 months old seedlings a new complication arises owing to the complete fusion of their base.... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942001200001 |
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| Germek,Emílio. |
| A description is given of a new method for the production of seedlings in planting of rice strains. This method has been used these three last years in connection with the improvement work on rice in the "Instituto Agronômico". Perforated cylinders, 14 cm high and 18 cm diameter, are distributed over the seed bed and the seeds of each strain sown inside. A week afterwards the cylinders are pulled up and used again. With this method seedlings are obtained with great facility and perfect separation between strains thus avoiding mixture of seeds. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942001200003 |
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| Franco,Coarací M.. |
| Knudson's asymbiotic method and medium for germination of orchid seeds were used with success. Heating this medium at 100°C twice for 15 minutes with an interval of 24 hours was found to be better than to sterilize just once at 120°C. This procedure avoids the hydrolysis of the agar. The poor quality of the glass from which some test tubes were made raised the pH tabove 5.9 and this was apparently the cause of poor developmen of the seedlings. Also some toxic elements given off by the glass diffusing thru the medium might havo impaired somewhat the results obtained in the experiment. |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942000700001 |
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| Jonker, F.P.. |
| Though an excellent, critical monograph of the genus Cassipourea was published some years ago by ALSTON (in Kew Bulletin, 1925, p. 241—276), I should like to make a few remarks on the South-American species of this genus as my revision for PULLE’s Flora of Suriname III.2 has brought to light a few new facts. It will also give me an opportunity to refer to a publication of BRIQUET on some American representatives of this genus (in Candollea IV, 1931, p. 342—350), which disagrees with regard to a number of species with ALSTON’s interpretations. The species which covers the largest area is the chiefly West-Indian C. elliptica (Sw.) Poir. Formerly also a number of West- Brazilian and Peruvian specimens were referred to it, but ALSTON pointed out that these... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/534887 |
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| Forster,R.. |
| Observations were made with tobacco plants which, after being naturally infected in the field by the virus of "vira-cabeça", a disease identical to spotted wilt (3), not only resisted to it, but exhibited complete recovery. Several trials were carried out in order to ascertain the following points : 1) whether the recovery means a greater degree of individual constitutional resistance ; 2) whether it represents an acquired immunity or ; 3) whether it is just of pure accidental nature. Plants showing recovery were selfed and seeds collected from them sown in separate rows. The same procedure was always applied with the new recovered plants. Thus, strains of plants were obtained representing several succeeding generations of recovered plants. In 1940-41... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942001200002 |
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| Bakker, D.. |
| Besides the Amathusiidae in the general collection the Rijksmuseum van Natuurlijke Historie at Leiden possesses a considerable number of representatives of the group, in excellently preserved specimens, in the collection of the late Mr. J. H. Jurriaanse. Moreover I could study the Amathusiidae in the collection of the Zoological Laboratory at Groningen, at present in the custody of the Leiden Museum. After I had completed my work at Leiden I had an opportunity to examine the material of the group in the Zoologisch Museum at Amsterdam, which, besides the general collection of the Society "Natura Artis Magistra" consists of the collections of the late Messrs. A. Mos and P. J. van den Bergh. In the following pages the different collections at Leiden are... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/318219 |
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| Deelder, C.L.. |
| In 1941 and 1942 I studied the rather extensive collection of Erotylidae in the Rijksmuseum van Natuurlijke Historie, the results of this study are given in the following pages. The collection is chiefly composed of material which during a long series of years gradually was acquired by the Museum, though a great deal formerly was a part of private collections which later as a whole became the property of the Museum and then the specimens were incorporated into the general collection. The most important of these private collections is that of Dr. H. J. Veth, other important collections are those of Dr. D. MacGillavry, and of Mr. J. J. de Vos tot Nederveen Cappel, the latter collection recently presented to the Museum. Moreover the Museum possesses certain... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/318060 |
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| Hellebrekers, W.Ph.J.. |
| In 1910 the Rijksmuseum van Natuurlijke Historie at Leiden obtained the important egg collection from Surinam, brought together by Messrs. F. P. and A. P. Penard. Owing to different circumstances this collection as a whole was not studied again, and, with the exception of some notes in papers by Schönwetter (1932, 1933) nothing has been published upon the material since it came into the Museum. In 1941 and 1942 I had the opportunity to rearrange the oölogical collections of the Leiden Museum, and during this work the Penard material was incorporated into the general collection. During my study of the material I became convinced that it is worth while to publish more detailed data than those contained in the works of the Penard's. This especially holds as... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.83. |
| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/318020 |
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| Bremekamp, C.E.B.. |
| Among the Acanthaceae grown in the glasshouses of the University Botanic Garden, Utrecht, a plant labelled Aphelandra velutina drew my attention, first, because it obviously belonged to an entirely different genus, and secondly, because a description under this name could nowhere be found. The coincidence of these two grounds for bewilderment might be explained by assuming that Aphelandra was merely a perversion, probably caused by the inadvertency of a transcriber, of the true generic name. This sounded plausible enough, but the name itself could not be found, for all attempts to refer the plant to one of the existing genera failed. It looked as if the plant might have been described somewhere, but for the time being there was no indication at all as to... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/535020 |
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| Brieger,F. G.; Gurgel,J. T. A.. |
| The preliminary work with vegetables was described and special reference was-made to the group Brassica oleracea. a) Plants flowering easily in Piracicaba and probably in the whole State of São Paulo. To this group belongs the lettuce, endive, chichory, carrot, radish, kale, brocoli and cauliflower. b) Plants where special treatment is necessary for flowering, as cabbage. c) Plants that did not flower up to this moment, as Svisschard beet and beet. Three main factors contribute for the seedless condition in the group cabbage : lack of flowering, anormalities of the flowers and self-sterility. The preliminary experiments in controling these factors seem to indicate the possibility of seed production in this group. The systematics of the two species Brassica... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1942 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051942001100002 |
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| Roon, J.M. van. |
| In 1939 J. M. van Roon and J. J. ter Pelkwijk published some data on two specimens of Orthragoriscus mola (L.) stranded on the Dutch coast. Measurements of bones and muscles of the jaw were given on account of the functional treatise concerning the mechanism of the jaw of Orthragoriscus given by Van Dobben (1935), based upon one specimen that differed in many ways from both individuals we dissected. In the following years, we got three more specimens and an examination of the jaw muscles proved them to be fully agreeing with the two fishes described before. It seems worth while to publish corresponding data and measurements. Specimen C, a female, stranded December 12, 1939 near Kamperduin in the neighbourhood of Schoorl. This fish was more oblong than... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.81. |
| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/319100 |
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| Henrard, J.Th.. |
| During the preparation of an account of the grasses for the flora of Dutch Guiana many difficulties were found in the identification of species of the genus Axonopus. Our knowledge as to the most recent treatment is entirely based upon Doell’s work for the Flora Brasiliensis. It is, however, evident that Doell did not see many types and his concept of many species proves to be incorrect. The modern genus Axonopus is not accepted by Doell but treated by him as a section Emprosthion of the large genus Paspalum. The difficulties arose already when he treated Fluegge’s Paspalum furcatum which is a continental North American species. Raddi’s Paspalum obtusifolium from Brazil, although given as a synonym, is a quite distinct species. As another synonym is... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/525576 |
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| Zaneveld, J.S.. |
| As far as I know, only three papers are dealing with Charophyta of the Netherlands West Indies. In 1858, in “Monatsbericht der königlichen Akademie der Wissenschaften, Berlin”, BRAUN records two species from Paramaribo, viz. Nitella microcarpa A. BR. and Chara hydropitys REICHENB. ap. MOESSL. These species are also enumerated in the “Fragmente einer Monographie der Characeen” (BRAUN & NORDSTEDT, 1882), in which another species is recorded from Curaçao, viz. Chara gymnopus A. Br. f. curassavica A. BR., now to be named Chara zeylanica Willd. f. curassavica (A. BR.) H. et J. GROVES. The third paper is that of H. and J. GROVES in URBAN’s Symbolae Antillanae (1911), in which the last-named species is once more recorded. In 1930 Mr P. WAGENAAR HUMMELINCK... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/535212 |
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| Hamel, Gontran. |
| Les Chlorophycées du golfe de Gascogne sont encore peu connues. Elles n’ont fait l’objet que d’une courte énumération de C. Sauvageau dans son travail ”sur les Algues marines du golfe de Gascogne“. J’ai repris cette étude au cours d’un séjour à Saint-Jean-de-Luz et à Biarritz, pendant le printemps de 1940. J’ai récolté les espèces suivantes: 1. Prasiola stipitata Suhr — Se rencontre dans le port de Saint-Jean-de-Luz au niveau de l’ E. marginata. Il est de petite taille, ne dépassant guère 1 cm de hauteur. Il se présente parfois sous la forme ordinaire, élargie en lame au-dessus d’un stipe uniforme; mais, plus souvent, il forme une simple languette, étroite et contournée, à aspect d’ Entéromorphe et rappelle alors le Prasiola calophylla. |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/526296 |
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| Registros recuperados: 119 | |
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