INDEX TO VOLUME III 
593 
Tissue tension, a study of permeability 
by the method of, 562 
Tobacco leaves, efifect of environmental 
conditions on, 493 
Torenia glabra, 586 
Toxicity of bog water, 436 
Transeau, Edgar Nelson. The peri- 
odicity of freshwater algae, 121 
Trapa bicornis, 587 
Treubia insignis, archegonium and sporo- 
phyte of, 261 
True, Rodney H. and Stockberger, 
W. W. Physiological observations on 
alkaloids, latex and oxidases in Papa- 
ver somniferum, i ; and Harley Harris 
Bartlett. The exchange of ions 
between the roots of Lupinus albus 
and culture solutions containing three 
nutrient salts, 47 
Turesson, Gote. Lysichiton camtschat- 
cense (L.) Schott, and its behavior in 
sphagnum bogs, 189 
Types of variable pubescence in plants, 
470 
Uredinales found upon the Onagraceae, 
527; index to, 561 
Uredo nootkatensis, 44; Chamaecyparidis- 
nutkaensis, 44 
Urena chinensis, 587 
Vicia faba, orientation of roots of, 288, 
292, 298, 301, 314, 408, 410, 412; 
sativa, 288 
Vitis vulpina, Phylloxera leaf gall on, 
337 
