INDEX 287 



Tonicity, effect of chlorophyll-content on, 147 ; of excess of starch-content 

 on, 147 ; of stimulus on, 148 



Tonometer, 146 



Torsion Balance, for determination of increase of weight during photo- 

 synthesis, 205 



Weight, new method of determination of photosynthetic increase of, 203 

 Wilmott, 15 



Printed in England at The Ballantyne Press 



Spottiswoode, Ballantyne & Co. Ltd. 



Colchester, London & Eton 



