224 EXPERIMENT STATION RECORD. [Vol. 36 



study of the early stages of crown rot. Important hypotheses and investigations 

 are given in some detail and compared with each other in relation to the author's 

 observations. In the main, the present purpose of the article is to restate the 

 questions raised by the investigators, though sometimes in modified form. A 

 restudy of the structural and tension changes accompanying periodic growth 

 may also, it is thought, lead to an investigation of the enzyms active during 

 radial growth and to the effect which adverse changes of environment have 

 upon them while in an active condition. 



Winter foliation in beech, F. Webee (Ber. Deut. Bot. Gesell., 34 (1916), No. 

 1, pp. 7-13, fig. 1 ) . — Potted young plants of Fagns sylvatica, after being exposed 

 to acetylene gas for three days early in December and then brought into the 

 hothouse, began to develop leaves by the end of the month, and during the first 

 and second weeks of January the plants which had been exposed to the gas 

 became covered with leaves while the controls showed no sign of awakening. 

 The claim that a very prominent part is played by light in foliar development 

 in winter is questioned. While the stimulating influence of light is admitted, 

 it is thought that even the dim light of winter days may be more than sufficient 

 to supply the light requirement as regards leaf development and that the winter 

 rest of plants is therefore due primarily to other causes than a lack of illumi- 

 nation. 



The action of light on the living organism, F. Schanz (Biochem. Ztschr., 

 71 (1915), No. Jf-S, pp. 406-414). — This is largely a discussion of contributions 

 made by others than the author, who, however, claims to have shown by experi- 

 mentation described that chlorophyll can act as a vigorous catalyzer even on 

 serum albumin. 



The measurement of oxidation potential and its signifi.cance in the study 

 of oxidases, G. B. Reed (Bot. Gaz., 61 (1916), No. 6, pp. 523-527, figs. 2).— The 

 author describes an apparatus and a method by which, it is claimed, excellent 

 results may be obtained, at least in some cases, in studying the effect of a 

 catalyzer in accelerating an oxidation reaction. Some results already obtained 

 are to be described in subsequent papers. 



The significance of color changes in oxidase reagents, G. B. Reed (Bot. Gaz., 

 61 (1916), No. 5, pp. 4^0-432). — Quantitative values are presented as obtained 

 in tests intended to supply workers in oxidase reactions with quantitative as 

 well as qualitative data upon which to proceed in their investigations of this 

 class. The oxidation necessary to produce color in ordinary oxidase reagents 

 or in plant chromogens appears to be very small. After the color has appeared, 

 it is thought that the oxidation may continue without further change of color. 

 The oxidation necessary to produce color in various reagents varies over a 

 wide range. ^_^ 



A comparative study of nutritive solutions, I. V. Iakushkin (Jakouch- 

 KiNE (Iz RezuVt. Vcget. Opytov Lab. Robot (Rec. Trav. Lab. Agron.), 10 

 (1914), pp. 25S-288, figs. 6; NieskoVko^ Dann'ikh po NormaVn'im SmQsiam, 

 Moscow: R{abushinskikh, 1915, pp. 32, figs. 6). — Employing modifications as in- 

 dicated of several common nutritive solutions in sand cultures, the author tested 

 the influence exerted by each on different economic plants. These were found to 

 respond in different ways and were modified variously by external conditions. 

 Crone's solution, as here modified, gave improved results with millet, barley, 

 buckwheat, and lupine. With Camelina, the solution of Prianishnikov was more 

 favorable. With flax, the solutions of Knop, Hellriegel, and Prfanishnikov gave 

 better results than were obtained from Crone's solution. 



The action of saline solutions on living plants in causing a reversible re- 

 moval of basic substances from the plant, H. Devaxxx (Compt. Rend. Acad. 

 Sci. iParis], 162 (1916), No. 15, pp. 561-563). — In experimentation described 



