144 



Experimental Zoology 



striped worms, yellow cocoons, and black moths. The results 

 are shown in the table, in which the horizontal lines represent the 

 stages of each individual. 



Thus there are nearly equal numbers of white and striped worms 

 (235 and 224); the same holds nearly for the two characters 

 of the cocoons (240 and 219). No worms intermediate in color 

 wTre found nor were there intermediate conditions between the 

 cocoons.^ It will be seen that all the moths were black (mela- 

 nitic), yet Coutagne thinks some influence of the white was 

 present. 



(5) Crossing individuals with different characters gives at times 

 offspring all like one parent, without the other character show- 

 ing any influence in the first generation. For example, an 

 individual of a race with ivhite worms, cocoons, and moths was 

 crossed with an individual having white worms, but yellow co- 

 coons and black moths. All of the cocoons were white. 



An individual of a race having black worms, white cocoons, 

 and moths was crossed with an individual having white worms, 

 yellow cocoons, and black moths. All of the cocoons were 

 white. 



An individual of a race having hlack worms, white cocoons, 

 and white moths was crossed with an individual having white 

 worms, yellow^ cocoons, and black moths. All the worms were 

 black, about half the cocoons were yellow and half white (262 and 

 248), without any intermediates. All the moths were black or 

 blackish, but rarely one was almost white. 



In a third case an individual of a race having black worms, 

 white cocoons, and white moths was crossed with an individual 



' Certain double cocoons that were rejected did not show intermediate colors. 



