6 



MISSISSIPPI EXPERIMEXT STATION. 



that the hyl)ri(l inlicritc<l from G. elliptica (its ]X)llcn parent), its 

 epidemiis, e]jiilernial straetures, and its mesophyll, while strengthening 

 tissue was inherited from the other parent. Other parts were inter- 

 mediate. Cistus Salvifolius x Ilehanthemum haHmifohum showed 

 mucli the same when eompared with its fjarents. From these cases 

 the autlior was of the 0|.)inion that the pollen ])arent could be determined 

 Idv a study of the epidermis of the hybrid. 



Daguillon (1905), from a study of the structure of Linaria 

 ochroleuca in comparison with L. striata and L. vulgaris, confirmed 

 the supposition that the former was a h\'brid fjetween the other two 

 species. The structural characters were mostly of an intermediate 

 nature. 



Penhallow (1905) studied the stnicture of a hvljrid Catalpa to 

 determine whether C. speciosa or C. bignonioidcs was a parent. Struc- 

 tural characters peculiar to C. Vjignonioides were fotmd, hence it was 

 inferred that this species was a ])arent. The other parent, C. Kaemferi, 



Fig. 1. — Nicotiana Tabacur 



