|
|
|
| Registros recuperados: 226 | |
|
| |
|
| |
|
| |
|
|
| Jeuken, M.. |
| At the instigation of the Director of the “Rijksherbarium” at Leiden, Prof. Dr H. J. Lam, who was puzzled by the problem of the delimitation of the genus Isonandra towards other genera, especially Palaquium, I assumed the task to compose a monograph of Isonandra. For this study material was kindly put at our disposal by the directors of several institutes, which enabled me to check up the type-specimens of all species, except that of Isonandra emarginata H. J. Lam, which failed to turn up even at Singapore and at Borneo. However, the Isonandra-character of this species is doubtful: it is more like Palaquium. It is my pleasant duty to express my sincere thanks to the directors of the institutes mentioned underneath, for their valuable cooperation. Our... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/526030 |
| |
|
|
| Stafleu, F.A.. |
| The genus Callisthene is found in the Extra Amazonian part of the Brazilian mainland, particularly in the zone of the campos and in the adjacent parts of Bolivia. The genus comprises eight species, as defined in this paper. It shows its greatest diversity on the central plateau of the Brazilian state of Minas Geraes. Most of the species are typical trees of the campos of the interior Brazilian plateau, which is characterized by a climate with a severe dry season. The genus was first described by MARTIUS in 1824. He mentioned all important characters and placed it in the Vochysiaceae, a family which had been described only four years earlier by A. DE ST. HILAIRE (1820). It was named after Callisthenes (360—327 B.C.), the Greek naturalist and historian of... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/534738 |
| |
|
|
| Bange, G.G.J.. |
| In January 1949 Professor H. J. Lam, director of the Rijksherbarium, Leyden, on his way to the 7th Pacific Science Congress in New Zealand, spending some time in Fiji, was shown by Mr B. E. V. Parham, Department of Agriculture, Suva, Viti Levu, Fiji Islands, a slender tree, cultivated in the Agricultural Experimental Garden Naduruloulou. The tree was unidentified and of unknown origin. Some flowering material was collected and at our request Mr Parham was good enough to send some ripe fruits in liquid for an investigation I was entrusted with. Additional material was studied from the herbaria at Brisbane, Kew, Leiden, Melbourne and Paris. It is my pleasant duty to tender my best thanks to the directors of these institutes for the loan of this valuable... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/524531 |
| |
|
|
| Graaf, Fr. de. |
| While studying the plankton community of the “Loenerveense Polder”, one of the lakes along the eastern bank of the river Vecht, I came across an unusually large form of the genus Hyalosphenia. The species occurred in a qualitative net sample taken from the open water. Only one living specimen and two empty thecae were then observed. Though numerous net samples were taken from the same locality throughout the year, I did not meet with the animal again, only empty thecae sometimes being found. However when for the purpose of recovering more specimens, samples of bottom mud were taken, the living animal was seen again, though only once, and in one living specimen. After that I did not succeed in catching the animal again. Describing a new species from such... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/505115 |
| |
|
|
| Fries, R.E.. |
| Xylopia surinamensis R. E. Fr. n. sp. — Ramuli novelli dense aureo-ferrugineo-sericei, vetustiores plus minus glabrescentes et cortice densissime lenticellifero punctato vestiti; internodia 0,5—1 cm longa. Foliorum petiolus sericeo-tomentosus, 5—7 mm longus; lamina rigida, anguste lanceolata, basi rotundato-truncata, apicem versus sensim longeque attenuata, summo apice obtusa, supra ab initio glaberrima sed densissime verruculoso-punctata, subtus dense argenteosericea, 8—11 cm longa et 2—2,5 cm lata; costa supra valde impressa glaberrima, subtus prominens teres; nervi secundarii cum venulis vix conspicui. Flores in inflorescentiis densis nonnulli; bracteae numerosae, late ovatae, 1,5—2 mm longae. Sepala fere omnino coalita, calycem cupuliformem... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/535115 |
| |
|
|
| Donselaar, J. van; Jonker, F.P.. |
| Up till now the lower deposits of peat (in Dutch: veen-op-groterediepte = peat at greater depth) have been investigated in the Netherlands mainly in the Western part of the country, viz. in the provinces of Noord-Holland, Zuid-Holland and Zeeland. The analyses have shown that the development of this, now comparatively well known peat layer must have begun either in the second half of the boreal period or else in the beginning of the atlantic one, and that it must have come to an end in the first half of the latter. Among the earlier investigators the botanist Mrs VERNEER-LOUMAN and some geologists had arrived at the conclusion that the sudden transgression of the North sea which made an end to the formation of peat, took place in the boreal period, and hat... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/535091 |
| |
|
|
| Vecht, J. van der. |
| The Oriental bees of the genus Ceratina Latr. are difficult to identify. Until now our knowledge of these insects consisted mainly of a considerable number (about 90) of isolated descriptions, scattered through several scientific journals. Most of these descriptions are based on colour characters and although these are certainly not without taxonomic value, they must be used with great care on account of their intra-specific variability. The structural and sculptural characters which are much more reliable for distinguishing the species have thus far not received sufficient attention. There exist a few keys, dealing with the species occurring in certain parts of the region, but none of these contains more than 11 species and the characters used are often... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.75. |
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/317571 |
| |
|
|
| Boeseman, M.. |
| In his valuable report on the freshwater fishes of British Guiana, Eigenmann (1912, pp. 64-73) gave a list of the species, together with comparable lists on the freshwater fishes of the adjacent regions. In sharp contrast with the number of 266 species reported from the Essequibo area only, the total amount of Surinam species proved to be but 118! Although since Eigenmann compiled these lists some more species have been reported from Surinam, the general situation has remained essentially the same, clearly showing the backward state of ichthyological research in this area. A possibility to improve our knowledge of this subject came when during the last four years the Rijksmuseum van Natuurlijke Historie received several more or less extensive collections... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.81. |
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/318641 |
| |
|
|
| Hoogland, R.D.. |
| The present paper is an extension of my revision of the Malaysian species of the genus Dillenia L. (Wormia Rottb. included) inserted in the revision of the Dilleniaceae in the Flora Malesiana ser. I, vol. 4, part 3, pp. 141—174, published in December 1951. A critical revision of the whole genus has never been published before; the unfortunate result of this has been that the delimitation of Dillenia and Wormia, usually as distinct genera, has been based on different characters by various authors. The extension of the revision for the Flora Malesiana so as to include the extra-malaysian species enabled me to study a number of species, the knowledge of which certainly confirmed me in my idea that the characters on which Dillenia and Wormia had been separated... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/525203 |
| |
|
| |
|
|
| Trivelin,A. P.. |
| The author studied in this paper effect of chicory (Chicorium intybus L.), kikuyugrass (Pennisetum clandestinum Hoahst) and a variety of Bermuda grass (Cynodon dactilon Pers.) named "Grama seda" as green feeds in growth of White Leghorn chickens (0-8 weeks). Males and females were se-pareted by feathering and development of comb. The results obtained can be summarized as follows : a) - Without separation of sex, the chickens that received green feeds showed better development than that did not receive green suplements. b) - The chicory showed to be something better that kikuyugrass and Bermuda grass, which had a similar effect. c) - The green feeds used had little influence in development of males. d) - The females in the lots suplemented by green feeds... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1952 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761952000100015 |
| |
|
| |
|
|
| Soudan, F. |
| The issue of the presentation of fresh fish to the consumer is far from being solved despite the numerous works which tackled this question. Too often, fishes sold away from the coast are not appetizing and numerous fish lovers prefer not to eat them, in the absence of very fresh fish. Indeed, many difficulties occur when it comes to shipping the dozens of thousands of tonnes of fish caught every year by industrial fishing boats to places located hundreds of kilometres away from the ocean. |
| Tipo: Text |
|
| Ano: 1952 |
URL: http://archimer.ifremer.fr/doc/1952/publication-6711.pdf |
| |
|
|
| Yates,Frank. |
| Êste artigo descreve os métodos que deveriam ser seguidos na análise de um experimento de rotação contendo rotações de duração diversa e na qual não foram incluídas tôdas as fases dessas rotações, de forma que as produções médias de uma determinada cultura, nas diferentes rotações, podem estar afetadas pela variação anual na produção dessa cultura. Foram ajustadas as constantes dadas pelo método de quadrados mínimos, usando-se, para êsse fim, o processo de aproximação sucessiva, descrito pela primeira vez por Stevens (2). A estimativa dos erros, que afetam as estimativas acima mencionadas, foi considerada detalhadamente. |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1952 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051952000300001 |
| |
|
|
| Arruda,H. Vaz de. |
| This paper describes the statistical analysis of an experiment with 22 soybean varieties, carried out at the Campinas Central Experimental Station, in order to test their resistance to root knot nematodes. The same check variety (Abura) was planted in each plot in order to estimate the infestation of the soil by nematodes. Subjective scores have been ascribed to each plot and to the check variety from 0 to 5, a score 5 to the varieties with highest incidence of nematodes. Two observations were made at intervals of 60 and 90 days after germination. The averages of these scores were used for the statistical analysis. Considering y as the variety score and x as the check variety score, it was possible by means of covariance analysis to eliminate from the... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1952 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051952000100005 |
| |
| Registros recuperados: 226 | |
|
|
|
