INDEX. 



321 



Water, absorbed by dead roots, 71 ; 

 absorption of, by transpiring 

 plant, 72 ; -culture, SI ; ex- 

 trasion under pressure of drops 

 of, 70; free from COj, appara- 

 tus for preparing, 24 ; use of, 

 in extraction, 225, 227 



Water-cress, used in De Saussure's 

 experiment, 66 



Water-plants, evolution of gas by, 

 30 



Wax-mixture, 26 n. 



Weight, gain of, in assimilating 

 leaves, 27 



Wheat, used in experiments on 

 starch, 276 ; on phosphates, 284 



Wiesuer, on heliotropism, 166 



Wind, effect of, on transpiration, 

 77 



Winkler-Hempel, method of gas- 

 analysis, 38 



Withering, mercury-pressure pro- 

 ducing recovery from, 82 



Wood, area of, greater than needed 

 for transpiration current, 85; 

 filtration of emulsion through, 

 83 ; injection of, by cocoa- 

 butter, 83 ; permeability of, by 

 air and water, 80, 81 ; swelling 

 against a weight, 107; young, 

 permeability of, by water, 81 



Wortmann, on light affecting nu- 

 tation of epicotyls, 183 ; on 

 intramolecular respiration, 6 



Xanthophyll, 43 



Yeast, used in experiments on 



enzymes, 288, 290 

 Tew, development of buds of, 181 



Zimmerman, on the diphenylamin 



reaction for nitrates, 59 

 Zopf, nutritive solutions for fungi, 



60 n. 



D. A. 



21 



