VISIBLE AND INVISIBLE CHARACTERS IN SILKWORMS. 135 



Table 1, showing the descent of cocoons up to the ninth 

 generation, with dates of elevages. 



Ital.-Jap. Hyb.<J v Nistri? Jan. 31, 1911 P l 



No. 1, 2-9 grs. x No. Af a 1'5 grs. 



No. 22 ? No. 15 $ No. 26? No.l3<J March 28 „ F 1 



3'7 grs. x 3-8 grs. 3*3 grs. x 2'8 grs. 



No.26<? v No. 33? April 28 „ F 2 



4'2 grs. x 37 grs. 



| 



No. 43? No. 21 $ No. 20? June 6 „ F 3 



4*1 grs. 5'1 grs. 5 grs. 



No.59(? No. 15? No. 5? v No. 4c? July 8 „ F 4 



3-8 grs. x 4'3 grs. 4'8 grs. x 5 grs. 



No.62<? No.19 No.26? v No.l8<? No.lo? v No.50<? No.52<J... Aug. 30 „ F b 

 4 grs. X 3'8grs. 4'4 grs. x 3'4gr3. 3*6 grs. x 32 grs. 4 grs. 



No.lOc? No.5? No.l<? No. 17? v No.l<? Oct. 10 „ F 6 



2-2 grs. x 2'8 grs. 3*6 grs. 3*6 grs. x 3'6 grs. 



No. 41 S v No. 55? No. 61? No. 27 <? No. 41c? Nov. 30 „ jP 7 



2'5 grs. X 2-4 grs. 1'9 grs. x 2'9 grs. 2'5 grs. 



No. 40? No.37<? No.23<? v No.20? Feb. 1,1912^8 



3 grs. x 2-8 grs. 2*2 grs. x 2*4 grs. 



No. 115 No. 113 No. 119 No. 221 No. 216 May. 22 „ F 9 



3*7 grs. 4'8 grs. 4*1 grs. 4 grs. 3*3 grs. 



were much superior to those of the intervening generations. 

 Even those of F 12 seriposited during the rains in July were 

 much better than those of F 10 (April) and F u seriposited in 

 October. As the raiyats in India grow about three or four crops 

 of cocoons a year (only rearing a few to keep the breed alive 

 when they are short of leaf) it would be to their advantage to 

 arrange that the crops reared are of every third generation. 



The cocoons obtained from this multivoltine race are much 

 superior to the Nistri ; those of F 9 were valued at about 9 J francs 

 per kilo in the Milan market, which is close up to the price of 

 good Italian cocoons, and the cocoons of F 13 , which were not 

 near as good as those of F 9 , were valued at about 7 francs per 

 kilo. The correct rendement could not be obtained, as the 175 

 cocoons sent to be tested were too few, 1 lb. weight of cocoons 

 being necessary. 



