258 2. Elementar-Organisationslekre. 



710) Strauch, Fr. W. (Aus d. physiol. Inst. d. tierärztl. Hochschule Berlin), 

 Die Monoaminosäuren aus dem Leim der indischen Tussahseide. 



(Zeitschr. f. physiol. Chemie 71,5/6. p. 365— 366. 1911.) 

 Die Untersuchung verschiedener Seidenarten ergab manche Differenz 

 zwischen wilden und kultivierten Seidenarten in ihrer Zusammensetzung. Eine 

 vergleichende Untersuchung des Leims der verschiedenen Seidenarten erschien 

 von Interesse. Der Leim der Tussahseide ergab auf 100 g aschefreier, bei 

 120° getrockneter Substanz: 1,5 Glykokoll, 9,8 Alanin, 4,8 Leucin, 5,4 Serin, 2,8 

 Asparaginsäure, 1,8 Glutaminsäure, 0,3 Phenylalanin, l,0Tyrosin und 3,0 Prolin. 



Dohrn (Berlin). 



711) Isliikawa, M., Cytologische Studien von Dahlien. 



(Bot. Magazine, Tokyo 25. p. 1—8. 1911.) 

 Ten species and varieties of Dahlias were examined. In Dahlia coro- 

 nata the somatic number of chromosomes was found to be 32, while in all 

 the other forms studied it was 64. The chromosomes of D. coronata are 

 somewhat larger than in the other forms. In the latter there is an obvious 

 tendency for the chromosomes to be in pairs in the metaphase and anaphase 

 of the homotypic mitosis, while this does not appear in D. coronata. The 

 number 64 is probably the tetraploid number of chromosomes. In the somatic 

 nuclei the chromosomes are in pairs in all the forms. This adds another 

 instance to the cases already known in which certain races have a tetraploid 

 number of chromosomes as compared with other related races or species 

 having the diploid number. Gates (St. Louis). 



712) Kuwada, Y., A cytological study of Oryza sativa L. 



(Bot. Magazine, Tokyo 24. p. 267—281. 1910.) 

 Several of the many Japanese races of rice were studied, but only minor 

 differences in the size of the chromosomes were observed. The diploid number 

 of chromosomes was found to be 24. Reduction is believed to take place by 

 parasyndesis or the pairing of threads, but the conjugation of chromatin threads 

 is said to take place only after synizesis. The chromosomes of the homotypic 

 division are found also to show a tendency to arrange themelves in pairs or 

 even in larger groups. The somatic chromosomes are often found to number 

 more than 24. 



The embryosac shows the usual development, and double fertilization 

 occurs. Three nucleoli are regularly found in the endosperm nuclei, which 

 is looked upon as evidence that the three nuclei which formed the endosperm 

 initial maintain their autonomy in the endosperm tissue. In some cases, the 

 fusion of two endosperm nuclei in one cell produces syntriploid nuclei. 



Gates (St. Louis). 



713) Taliara, M., Über die Kernteilung bei Morus. 



(Bot. Magazine, Tokyo 24. p. 281—289. 1910.) 

 Morus indica L. is found to have 14 pairs of chromosomes. In several 

 varieties of M. alba L. the number was found to be the same, but in one 

 variety, named "Shirowase", the somatic number was 40 — 50. The hetero- 

 typic gemini are found to be of different sizes and structures. similar diffe- 

 rences appearing in the somatic chromosomes. In the nuclear plate in somatic 

 cells of M. indica there are usually four long and two short chromosomes, 

 and the chromosomes are evidently arranged in pairs. The variations in 

 chromosome number in the same individual or in different races is supposed 

 to be due to the union or segmentation of Single chromosomes. 



Gates (St. Louis). 



