352 



INDEX 



Woods, on oxidizing enzymes 274 

 Wortman, influence of heat on plants, 99 

 Wound-cork, 36, 37, 38 

 Wounds, as stimuli, 33, 34, 36 

 Wright, on grafts, 322, 323 

 Wyethia, a compass plant, 139 



Yeast, fermentation by, 263, 264 

 relations to temperature, 63 



Zaleski, on influence of ether on respira- 

 tion, 253 



Zea, curvature of roots, 8 1 



decrease of weight in respiration, 



256 

 growth in air lacking carbon dioxide, 



231 



growth of roots of, 282, 283 

 nuclear division in, 281 

 path of sap in, 213 

 thermotropic curvatures of, 99 

 water cultures of, 223 

 Zimmermann, botanical microtechnique, 

 81, 147 



