What Puts ''Pop" ill Pop Corn. 



265 



Photomicroyriiph I showing geini ami luiclfus also starch grains of the unijoppcd 

 corn. X 50 by Dr. E. G. Mahin. 



Photomicrograph 4. — Showinj; 

 the c'll walls as 



■starch grains in unpopped corn, as white dots and 

 lack circles. X 100 by Dr. E. G. Mahin. 



