32 



HEREDITY AS ILLUSTRATED BY TRICHOMES. 



Fig. 8— Trichomes of Jaglans regia: a, awn-shaped trlchomes (x 84): bU>h, stages in the de- 

 velopment of disk-shaped trlcbomesj (x 535); i, abnormal disk-shaped trlchome ( x 1200); 

 j to'm, long secreting trichomes {j and k x 1200; I and m X 535): n to r, development of 

 short secreting trichomes, of which r is a transverse view of q (m, o, and p x 1200 ; q and 

 J-X535); a to I), short secreting trichomes from rather old leaf (x 535); w, short secreting 

 trichomes from growing tip of stem (x 535). (All figures reduced one-fourth.) 



