POLLEN AND PISTILS OP APPLES 



393 



figure 164. The remaimng tests were made on pollen from open 

 flowers, and at this time there was no trace of starch, except in 

 a very few apparently undeveloped grains. Occasionally slight 

 traces of sngar were seen, when tested with phenylhydrazine 



Fig. 163 



Fig. 164 



Fig. 165 



Fig. 166 



Fig. 163. — A pollen grain, shrunken and wall folded, a condition of apple 

 pollen after a few minutes exposure to the air. 



Fig. 164. — A pollen grain containing much starch. 



Fig. 165. — A pollinated apple stigma, showing its papillate character and 

 oosition of pollen with reference to the papillae. 



Fig. 166. — A portion of an apple stigma, at time of pollination, showing 

 papillae with their shrunken protoplasts, one pollen grain which has ger- 

 minated and another lodged on the end of a papilla and in a shrunken 

 Dondition. 



