578 



MINNESOTA BOTANICAL STUDIES. 



Table III. 



Showing difference in weight of dry matter between equal areas of the 



same leaf, one portion being covered 10 hours previous to 



weighing, and the other exposed to light. 



*Size of sample increased from 39.7 mm. to 48 mm. in diameter. 



Note. — Compare with above the results given by Sachs: Bin Beitrag 

 z. Kenntn. der Ernahrungsthatiykeit der Blaetter, Arb. Wi'irzb. 3: 1. 1884, 

 and Saposchnikoff: Bildung und Wanderung der Koklenhydrats in den 

 Laubbldttern, Ber. Deutsch. Hot. Gesellsch. 8:233. 1890. 



