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 folbwing : 



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 of 

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

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



