104 



PLANT BIOLOGY 



111. Nutrients stored in corn grains for the use of the seedling. 

 Laboratory Study No. 54. (Optional.) 



Grind with a mortar and pestle some corn grains till a fine meal 

 is prepared. Test for each of the food substances and fill out in 

 your note-book a table like the following : 



112. Of what importance is the endosperm in the develop- 

 ment of corn seedlings ? Laboratory Study No. 55. Home 

 work or demonstration. 



Soak twenty-four or more corn grains over night. Care- 

 fully remove from half of them all the endosperm (food 



1 To test for fat, put some of the cornmeal into a test tube, add 

 some ether, shake frequently, and let the tube stand for a time. At 

 the end of twenty-four hours pour off the clear liquid upon pieces o'f 

 glazed paper. After the ether has evaporated, hold the paper to 

 the light. Be careful not to hold the ether near a flame. 



