16 



HEREDITY AS ILLUSTRATED BY TRICHOMES. 



75.6 /A on the stem. The non- secreting- awn-shaped trichomes measured 

 from 218.8 !>■ to 316.8 /«. in length. 



The general relation of the trichomes of the hybrid and the pure lines of 

 Solatium are given graphically in table 5. 



'YKS.UE.h. — Comparison of the trichomes of Solanum villosutn X Solanum guinense 



with those of the pure species. 



*The numbers in parenthesis refer to hybrids of the second generation. 



The data at hand are not sufficient either in amount or in kind to permit 

 the tracing of the influence of the pure lines on the hybrid offspring. This 

 much is apparent, however: the trichomes of the non-secreting awn-shaped 

 type which the hybrid inherits from Solanum guinense are of full, not of 

 half size, as MacFarlane found in certain hybrids investigated by him 

 where unilateral inheritance also obtained.* 



*MacFarlane, /. c. 



