1913] Goodspeed: Germination of Tobacco Seed 215 



in the case of other species also, but in general the conditions 

 under which germination took place seemed to be the most 

 generally favorable that were available. 



VI. THE GERMINATION OF HYBRID VS. PARENT SEED 



On the possibility that there might be some correlation be- 

 tween the amount and time of germination and such segregation 

 as was observed in certain of the hybrids produced in the U. C. 

 B. G. a series of germination tests was carried out with hybrid 

 seed produced by the hybrids made between a number of iV. 

 Tahacum-YavietieB. The following table gives the germination 

 of the seed of 110/05, the germination of seed of 78/05 and the 

 germination of the seed resulting from the cross 110/05 X 78/05 

 and its reciprocal, together with the germination of the seed pro- 

 duced by one F, hybrid plant of both cross and reciprocal and 

 the seed of three F^ plants produced from the seed of these last 

 two individuals. H18 represents the cross 110/05 X 78/05 ; H20 

 its reciprocal. 



As will be seen the amount of germination of the seed of the 

 cross, the seed of the Fj hybrid and of the various F^ hybrids 

 was very nearly identical in each of the two cases — i.e., 1909 

 H20, 1910 Fj H20 P26, 1911 F, H20 P26 Pll and P26 P25 all 

 show practically the same amount of germination and the germi- 

 nation was scattered over some nineteen to twenty-five days — 

 while in 1909 H18, 1910 F, H18 P49, 1911 F, II18 P49 P25, 

 P49 P24 and P49 P22 very heavy germination took place within 

 a week. In the various generations of cross HIS tlie amounts of 



