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GOODSPEED (1933) has summarized his conclusions as to the cytogenetic relationships of some 40 species of Nicotianas which he has had under observation a t the UNIVERSITY OF CALIFORNIA for a number of years. The American species possess 9, 10, 12, or 24 pairs of chromosomes. [There is no dispute about the chromosome numbers for the various species except a(More)
Hermaphroditic animals and plants are known where fertilization of the eggs by the sperm or by the pollen produced by the same individual is very unusual. The extent of the phenomenon in the animal kingdom is unknown, Ciona intestinalis, an ascidian, having been the only species used in experimental work. In the angiosperms, the characteristic is(More)
It is shown (1) that Valonia and Halicystis cells exhibit varying degrees of tolerance to injections of animal peptone, animal proteose, crystallized egg albumen, and diphtheria toxin; (2) that Valonia cells display decreased tolerance to egg albumen in increasing dosages, although Halicystis is completely tolerant of the highest dosage used; (3) that the(More)
From the results of these tests it is clear that both Halicystis and Valonia have a high degree of tolerance for animal peptone, and a very high degree of tolerance for animal proteose and for egg albumen. The products of bacterial growths fostered by these proteins have a deleterious effect upon both species of algae; but, if it were possible to prevent(More)
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