PROCEEDINGS OF THE SOCIETY v 245 



Ewart's work on the longevity of seeds was touched on. The 

 inhibiting effect of carbon dioxide on the germination of seeds Was 

 mentioned. Details were given of various methods for storage and 

 preservation of seeds in damp and tropical climates. The importance 

 of enzyme action, illustrated by the conversion of starch into sugar 

 by saliva. Structure and use of the leaf. Experiments illustrating 

 assimilation, formation of starch in daylight, and its removal in the 

 dark. Plants purify the atmosphere for animal life by absorbing the 

 -carbon dioxide and replenishing the oxygen. The processes of res- 

 piration and transpiration were shown practically. Transpiration 

 coefficient. 



The structure and use of the root. How the plant absorbs 

 mineral matter from the soil by osmosis. General nature of the 

 mineral matter as represented by the ash of plants. 



VOL. IV, NO. 4, 1922. 



