vii OSMOTIC PRESSURES OF LEAF CELLS 151 



effects of carbon dioxide are not so marked nor so rapid 

 in their manifestation as in others. 



Tables 17 and 18 embodying the experiments on Tilia 

 americana, which was found very sensitive to this gas, 

 illustrate how carbon dioxide affects the transpiration and 

 turgescence of the leaves. 



Table 17. 

 Til in (tmr }(((( na in Carbon Dioxide. 



In experiments A, B, D, E, G, and H fresh branches 

 with 8-11 leaves were used; in C and F the branches 



