1 92 Heredity and Eugenics 



degree. Crossing was observed, however, among the com- 

 ponent species in all directions, and progeny emerged in 

 July, showing a combination to have been formed between 

 L. oblongata and L. decemlineata, with the L. nmltitaeniata 

 type and attributes wanting. The population, when 

 examined, showed individuals which were apparently domi- 

 nated by L. decemlineata (A) to the exclusion (as far as 

 visible) of all others; individuals which were very clearly 

 intermediate between L. decemlineata and L. oblongata (B) ; 

 and individuals which were more or less intermediate between 

 L. decemlineata and L. multitaeniata (C). Of these the 

 intermediate between L. decemlineata and L. oblongata 

 existed in by far the greatest numbers, as shown by the 

 following proportion : 



ABC 



131 397 92 



Inasmuch as this experiment was conducted in a large 

 cage and not in the open, it was manifestly impossible to 

 utilize all the individuals which emerged, so a reduction was 

 made for the matings for F^, excepting that any extreme 

 or rare t>pes were given every advantage over the more 

 common types. The following materials were selected at 

 random from the different groups as parents of the second 

 generation: 



These inbred rapidly during July and at the end of August 

 gave a second generation which was uniformly an inter- 

 mediate between L. decemlineata and L. oblongata. 



ABC 



o 58Q o 



