The Process of Heredity 545 



about as advanced as the average H pure at 7 days. Ten embryos 

 of each strain were used. Results: 



After 5 minutes, 5 M hybrids dead. 



After 14 minutes, i M pure dead, 5 M hybrids dead. 



After 16 minutes. 5 M hybrids, i M pure, and 2 H hybrids, 



dead. 

 After 22 minutes, 8 M hybrids dead, 2 feeble; 2Mpures 



dead; and 2 H pures dead. 

 After 36 minutes, 9 M hybrids dead, 3 M pures dead, and 



2 H hybrids dead. 

 After 38 minutes, all M hybrids dead, 4 M pures dead and 4 



feeble; 5 H pures dead. 

 After 46 minutes, M pure 6 dead and 4 feeble; H pures 8 



dead; H hybrids 2 dead. 

 After 53 minutes, M pures and H pures all dead ; H hybrids 



6 dead and 2 feeble. 

 After 60 minutes, 8 H hybrids dead, 2 feeble. 

 After 65 minutes, all H hybrids dead. 



This experiment show^s that in strains of the same degree of 

 advancement the M hybrids w^ere the least resistant, the M pures 

 next, the H pures next, and the H hybrids the most resistant. 



Experunent j. Only the two majalis strains used; ten embryos 

 of each used; six days old. The M hybrids were all dead before 

 any of the M pures; three of the M pures survived any of the M 

 hybrids. 



Experiment 6. Only the two heteroclitus strains used; ten of 

 each; six days old. Results: 



After 5 minutes, i H hybrid dead. 



After 8 minutes, i H hybrid; and 7 H pure dead. 



After 16 minutes, i H hybrid dead; 8 H pures dead, 2 



feeble. 

 After 26 minutes, i H hybrid dead; 9 H pures dead and i 



feeble. 

 After 35 minutes, 2 H hybrids dead; gH pures dead and 



I still feeble. 



