32 



HEREDITY AS ILLUSTRATED BY TRICHOMES. 



FIG. 8 Tricbomes of Jnulunx rei/ia: a, awn-shaped trichomes (x 84): b to h, stages In the de- 

 velopment of disk-shaped tricbomesj ( 535): /, abnormal disk-shaped trlchome ( X 1UOO); 

 .;' to;m, long secreting trlchonies (.;' and A 1200: / and in 5:te): n to ), development of 

 short secreting trichomes, ol which r Is a transverse view of </ (n, o, and p X 1200; q and 

 > <5S5): .1 to r, short secreting trichomes from rather old leaf (;< 535); w, short secreting 

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



