4 INHERITANCE IN SILKWORMS, I 



primary reproductive organs on the secondary sexual characters, re- 

 flexes of the moths, artificial parthenogenesis, etc. The results of much 

 of this work have already been published as papers in various scientific 

 journals. A list of these papers follows and an abstract of each one of 

 them may be found in the Appendix to the present paper. 



(with R. G. Bell) Notes on Insect Bionomics, in Jour. Exper. 

 Zool, v. i, pp. 357-367 August, 1904. 



(with R. G. Bell) Variations Induced in Larval, Pupal and 

 Imaginal Stages of Bombyx mori by Controlled Varying Food Supply, 

 in Science, N. S. v. 18, pp. 741-748, Dec., 1904. 



Regeneration in Larval Legs of Silkworms, in Jour. Exper. Zool., 

 v. i, PP- 593-599, 10 figs., Dec., 1904. 



Influence of Primary Reproductive Organs on Secondary Sexual 

 Characters, in Jour. Exper. Zool., v. I, pp. 601-605, Dec., 1904. 



Some Silkworm Moth Reflexes, in Biol. Bull., v. 12, pp. 152-154, 

 Feb., 1907. 



Sex Differentiation in Larval Insects, in Biol. Bull., v. 12, pp. 

 380-384, 8 figs., May, 1907. 



Artificial Parthenogenesis in Silkworms, in Biol. Bull., v. 14, pp. 

 15-22, Dec., 1907. 



At the same time that these miscellaneous studies in silkworm 

 biology were begun, a series of planned and controlled rearings was 

 started (one generation a year) to test the behavior in heredity of 

 fluctuating and sport variations of larvae, cocoons and adults. Also 

 experiments and rearings were carried on to test structural and physio- 

 logical modifications which might be induced by varying food supply 

 (both as to character and quantity) and the possible inheritance of these 

 modifications. From 1904 on the work has been turned chiefly to a 

 study of the modes of inheritance of various racial characters of eggs, 

 larvae and cocoons, involving controlled pure and hybrid matings of 

 individuals of some fifteen races. This study of heredity has served to 

 test, for the silkworm, the Mendelian principles of inheritance, as well 

 as the actuality of the potency in heredity of vigor, of sex, and of special 

 characters. Finally the hypothesis of individual and race idiosyncrasies 

 in matters of inheritance has been tested. The present paper is a first 

 contribution of data and results derived from this general study of 

 silkworm inheritance. Any discussion of a possible practical applica- 

 tion of these results in connection with commercial silk culture is 

 reserved for a future paper. 



From 1900 to June, 1905, Mrs. R. G. Bell (now Mrs. R. G. Smith), 



