Physiologie. 375 



composition of the plasma membrane and this change occurs before 

 the NaOH penetrates to the interior of the cell; while protein and 

 lecithin may decrease the sensitivity of neutral red the eflfect is 

 the same for NaOH as for NH4OH; the nature of the neutral red 

 combination in the cell does not affect its degree of sensitivity for 

 different alkalies; and the indicator method is therefore a perfectly 

 adequate one. M. C. Merrill (St. Louis). 



Hepner, J., Aus der Physiologie der Hydra. (Vestnik V. sjez. 

 ces. pn'r. p. 400. 1914. Böhmisch.) 



Den Botaniker wird aus dieser Arbeit nur die Erwähnung der 

 Tatsache interessieren, dass die grünen H3^dren ohne jeden Zweifel 

 symbiotisch mit den Algen leben. Die Versuche über die Lebens- 

 dauer in Sauerstofflosen Medien bei den grünen und braunen 

 Exemplaren, sowie andere Modifikationen dieses Grundversuches 

 haben es als eindeutig richtig erscheinen lassen. Jar. Stuchlik. 



Kimball, G. W. and E. £. Cartes. Influence ofshade and 

 other factors on plantations. (Forestry Quart. XL p. 176—184. 

 1913.) 



Observations made in October and November 19r2at Petersham, 

 Massachusetts, on seedlings and transplanted white pine, Scotch 

 pine and red oak, which had been subjected to various conditions 

 during the drought of that summer, are of interest with respect to 

 survival. Of white pine partly shaded 85.5 per cent were alive, 

 while of those exposed only 56.5 per cent survived. Again, root 

 competition for the same plants reduced the survival from 85.5 per 

 cent to 65 per cent. The proximity of stones to the roots also 

 affected a reduction. Transplants were hardier than seedlings, and 

 the Scotch pine hardier than the white under similar conditions, 

 The data for red oak are limited but they indicate a higher percen- 

 tage of survival than for white pine. M. C. Merrill (St. Louis). 



Korinek, J., Aus der Physiologie von Anthokyanpflanzen. 

 (Vestnik V. sjez. ces. pn'r. p. 401. 1915. Böhmisch.) 



Was die Beschaffenheit von Anthokyan betrifft, bestätigt Verf. 

 die von Comb es und anderen ausgesprochenen und bewiesene An- 

 sicht, dass es sich um einen Reduktionsprodukt von Chromogenen, 

 farblosen Stoffen handelt. Die biologische Funktion dieses Farb- 

 stoffes ist bisher nicht eindeutig erklärt. Die meisten Vermuthun- 

 gen triffen wohl nicht zu. Jar. Stuchlik. 



McNutt, W. and G. D. Füller. The ränge of evappration 

 and soll moisture in the Oak-Hickory Forest Association 

 of Illinois. (Trans. 111. Acad. Sei. V. p. 127—137. fig. 1—6. 1914.) 



The work was done from April to November, 1911, and the 

 region studied was a forest about twenty miles from Chicago. The 

 studies embraced evaporation and soil-moisture determinations 

 throughout the season, the former made by the Livingston atmo- 

 meter and the latter included the Briggs and Shantz method for 

 ascertaining the wilting coefficients. As a result of the evaporation- 

 studies the positian of the oak-hickory forest between that of the 



