136 



MISS MAUDE L. CLEG HORN ON THE INHERITANCE OF 



Experiment B. — Cross between univoltine Ital.-Jap. Hybrid 

 2 and multivoltine Nistri . 



This was carried out for four generations only and then 

 discontinued, as the cocoons were not as good as those of the 

 reciprocal cross, rarely averaging a weight of 3*5 grains. 



Results of Experiment as regards the Multivoltine and Univoltine 

 character of the Silkworm Moths. 



Experiment A. 



Table 2, illustrating the descent of the univoltine character in 

 the cross between ital.- jap. and nlstri $ . 



Multivoltine Nistri ? X Univoltine Ital.-Jap. $ ... P x 



Layings all multivoltine 

 Many more $ s than $ s. 



22 layings univoltine. 30 layings almost univoltine. 6 half multivoltine F 2 



More $ s than $ s. , 



6 layings univoltine. 16 about half univoltine. 2 multivoltine W% 



More ? s than $ s. 



A few layings univoltine. One 75% multivoltine. Many partly multivoltine ... F± 

 More <?s than ?s. 



One 75 % multivoltine. 2 half multivoltine, 15 partly multivoltine , F& 



s and $ s about equal. 



I 



All about half multivoltine F§ 



i i i 



Nearly all about half multivoltine. A tew about 75% multivoltine Fy 



Nearly all completely multivoltine F s 



All multivoltine JFV 



I 



All multivoltine J^io 



