THE DETERMINATION OF DOMINANCE. 



319 



It was, of course, impossible to tell on inspection what the 

 constitution of each of these types was. 

 Five classes of adults were recognized : 



(a) Those which were clearly either pure, or dominants of the 

 L. oblongata type. 



(b) Those which were clearly intermediate hybrids between L. 

 decemlineata and L. oblongata. 



(c) An L. decemlineata type in which L. decemlineata was in the 

 main dominant, but which exhibited a variable range of 

 variability. 



(d) Intermediate hybrids between L. decemlineata and L. multi- 

 tczniata. 



(e) Forms which were either L. multitceniata pure, or heterozy- 

 gotes in which L. multitceniata was completely dominant. 

 Out of 1,857 adults seriated, the following census was made: 



This census shows that while L. decemlineata is either the 

 dominant or prepotent member of the combination, it did not 

 come out of the mixture entirely without contamination. 



This experiment was continued in a cage exactly like the first, 

 and the following materials were taken at random from the first 

 generation as the parents of Generation II. 



This material immediately began breeding and gave during the 

 month of August a large progeny which emerged early in Sep- 

 tember, and immediately went into hibernation. When seriated, 

 this material gave the following results: 



These passed the winter of 1908-09 in the ground and emerged 

 in June, 1909. All that emerged were allowed to reproduce in 



