Varietäten etc. — Physiologie. 27 



Stockberger, W. W., A literary note on Mendel's law. 

 (American Naturalist. XL VI. p. 151 — 157. 1912.) 



Owing to the relative inaccessibility of Mendel's original pu- 

 blicaiions the exact terms in which he formulated his conclusions 

 have not been readily available. To meet in some measure this 

 lack of ready reference a brief, synoptic Statement of the funda- 

 mental principles of Mendel is given in his own words and trans- 

 lations, together with certain coUateral notes that may be of value 

 to s:udents of this important law. Jongmans. 



"Wilson, E. B,, Some aspects of cytology in relation to 

 the study of genetics. (American Naturalist. XLVI. p. 57 — 67. 



1912.) 



The essential conclusion that is indicated by cytological study 

 of the nuclear substance is that it is an aggregate of many different 

 chemical components, which do not constitute a niere mechanical 

 mixture, but a complex organic sysLem, and which undergo per- 

 fectly ordered processes of segregation and distribution in the cycle 

 of cell-life. That these substances play some definite röle in deter- 

 mination is not a mere assumption, but a conclusion based upon 

 direct cytological experiment, and one that finds support in the 

 resalts of modern chemical research. Kossei has recently said 

 that every pecuiiarity of the species and every occurrence affecting 

 the individual may be indicated by special combinations of protein 

 "Bausteine". The point of view that has been indicated in the pre- 

 sent paper is entirely in accordance with such a conception. The 

 results of cytological inquiry fit with the view that there are many 

 such combinations in both nucleus and protoplasm; and the interest 

 of cytological study lies in the fact the we can in some degree 

 foUow out their modes of segregation and distribution with the micros- 

 cope. We are still utterly Ignorant as to how these processes are 

 determined. The cytological studies have as yet made no approach 

 to their limit, and a vast unexplored field lies before tis. Our pre- 

 sent rüde notions of cell-organization are of use in so far as they 

 help to open new points of view or to discover new facts, whether 

 in cytology or in genetic inquiry. In both regards they have already 

 proved worth while. Jongmans. 



Knight, R. C, A convenient modification of the poro- 

 meter. (New Phyt. XIV. p. 212—216. 1 textfig. 1915.) 



The author describes and figures a modification of the Darwin 

 and Pertz porometer (Proc. Roy. Soc. Lond. 84 B, p. 136. 1911). 

 He enumerates the advantages of his apparatus, and describes a 

 typical experiment in detail in order to show the exact method 

 of use. Agnes Arber (Cambridge). 



Steinbrinck, C, Zu den Kohäsions- und Osmose Fragen. 

 (Ber. deutsch, bot. Ges. XXXIII. p 451—460. 1915.) 



Der Verf. möchte zunächst einen Fingerzeig geben, wie sich 

 auf das Ergebnis der Arbeiten von Renner und Ursprung die 

 Probe anstellen lässt und zwar durch Abänderung eines Versuchs 

 von Schrodt, den Ursprung erwähnt. Verf. verweist dabei auf 

 einen von ihm in Flora 1903, Bd. 92 abgebildeten und beschriebenen 



