The New Phytologist

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Sir Arthur George Tansley
Academic Press, 1905 - Botany
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Page 78 - Men have not discovered and cultivated within the last two thousand years a single species which can rival maize, rice, the sweet potato, the potato, the breadfruit, the date cereals, millets, sorghums, the banana, soy. These date from three, four, or five thousand years, perhaps even in some cases six thousand years.
Page 170 - Im 2. Teil bespricht Verf. die Evolution des Sporangiums. Hier lautet sein Resümee wie folgt: „It is obvions from all that nos been said above, the the Sporogonium of the primitive Bryophyte is at once the homologue: 1. of every type of foliar organ; 2. of every type of sporangiophore: 8. of every type of sporangium whether eu- or leptosporangium, no matter in what jjroup of plants it may occur: 4.
Page 142 - ... physicists, supposes that the energy is derived from the radio-atoms themselves and is released in consequence of their disintegration. The latter theory involves the conception that the atoms of the radio-elements contain a great store of latent energy, which only manifests itself when the atom breaks up. There is no direct evidence in support of the view that the energy of the radio-elements is derived from external sources, while there is much indirect evidence against it. Some of this evidence...
Page 133 - The three morphological categories of organs, viz., the leaf, stem, and root, which have persisted and remained distinct each from the other ever since the antiphytic generation attained any development find their natural origin, therefore, in the capsule, seta, and foot or sucker respectively of the primitive Bryophytic sporogonium.
Page 138 - ... than the rolling direction much lower ductilities are exhibited. When there are two working directions, as for example in crossrolling, high elongations can occur in both directions, but the ductility in the direction perpendicular to the plane of the sheet is again very low. THE TOXICITY OF BERYLLIUM One of the most important points to be taken into account in processing beryllium is that it is highly toxic. This manifests itself in two main forms — an acute irritation of the respiratory tract,...
Page 82 - ... attacks of grazing animals is a matter of such general belief as to be admitted into certain botanical text-books as a proved fact. " It seems, however, to me that my experiment, detailed above, is a fairly crucial case, and that in Discaria Toumatou, at any rate, .the spines are a direct response to conditions of dryness, and function as a special contrivance for checking transpiration. If so, then they have nothing to do primarily with attacks of grazing animals, especially when it is borne...
Page 248 - ... to give expression to the fundamental law of habitats, namely, that it is the physiological water content, and not the physical, which determines the impress of the plant and of the formation. Accepting the easily demonstrable fact that an excess of salts or acid in the soil water, as well as cold, tends greatly to diminish the available water of the soil, ie, the physiological water content, it is at once seen why saline, bog and arctic plants are as truly xerophytic as those that grow on rocks...
Page 136 - On Spore-Formation and Nuclear Division in the Hepaticae. Annals of Botany, Vol. IX, 1895.
Page 62 - ... individual ovules, the identity of which is lost as regards external forms." On this same subject Worsdell (Principles of Plant Teratology, i., p. 93) quotes Treube, who "describes a case in which Loranthus sphaerocarpus, the fertilized ovum divides by a vertical wall, but the sister-cells develop together into a single proembryo, consisting of a double row of cells. The case of imperfect twins, in which the lower part of the structure is undivided while the upper is separated into two similar...
Page 82 - Goebel, one of the greatest of modern botanists, recently said : — "I do not think that up till now any more has been proved, than that in moist air the formation of prickles and thorns is retarded ; there is no proof that it can be suppressed. ' '* Dr. Cockayne seems clearly to have shewn that complete suppression is possible. Such a remarkable experiment as this cannot fail to be profound and far-reaching in its effect on biological ideas of the species. As will be pointed out (v. Plagianthus...

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