THE DETERMINATION OF DOMINANCE AND THE 

 MODIFICATION OF BEHAVIOR IN ALTERNATIVE 

 (MENDELIAN) INHERITANCE, BY CONDITIONS 

 SURROUNDING OR INCIDENT UPON THE GERM 

 CELLS AT FERTILIZATION. 



WILLIAM LAWRENCE TOWER. 



A CORRECTION AND ADDENDUM. 



In the preparation of the paper which appeared in this journal 

 under the above title, certain minor experiments were taken 

 from a larger series and combined to illustrate a general point 

 in the behavior of alternative characters in inheritance. Through 

 some unhappy oversight the data and plate of Ex. No. H. 410 

 was introduced into the printer's copy in place of the experiment 

 intended for the position and indicated by the remainder of 

 the paper. In this correction and addendum I have supplied 

 the necessary data of the proper experiment with the corre- 

 sponding illustration, which replaces Plate II. in the original 

 paper. I am indebted to Professor Cockerell for calling my 

 attention to this misplacement. 



On page 294 of Vol. XVIII. of this journal, substitute the 

 following for the account given under Ex. No. H. 410. 

 L. signaticollis 9 X c" L. diversa. 

 Ex. No. H. 411. 



When a cross was made between a female L. signaticollis and 

 a male L. diversa of exactly the same stocks as described in Ex. 

 No. H. 409, under the following conditions a quite different 

 result was obtained. 



Food: normal and uniform. 



T. R. H. 



Day Av. 75 F. =*= 5 F. Day Av. 50 per cent. 10 per cent. 



Night Av. 50 F. 5 F. Night Av. 80 per cent. 15 per cent. 



In the FI generation of this experiment there was only one 

 class of adults and these were all of the female type and exhibited 

 a narrow range of variability. These when inbred, gave in F 2 



6; 



