THE AMERICAN NATURALIST [Vol. L 



Having chosen these categories of the character fecun- 

 dity because they appeared to represent natural divisions, 

 I proceeded to show for hundreds of matings the distribu- 

 tion of the progeny when individual females whose per- 

 formance fell into one or another of the categories were 

 mated to particular males. This was done both for the 

 pure bred Barred Bocks and for crosses. The results 

 at once showed that definite ratios were appearing with 

 regularity and constancy. Further analysis showed that 

 a Mendelian hypothesis which postulated two factors, one 

 sex-linked and the other not, accounted for all the facts. 



If all this does not conform to the classic canons of Men- 

 delian experimentation, I am sure I do not know what does. 



V 



Castle charges me with suppressing data. There are 

 just two things which I wish to say regarding this charge. 

 The first is that I shall publish the complete raw data of 

 my work on the inheritance of fecundity when I have fin- 

 ished my own study of these, and not sooner. I am using 

 this material for the study of various problems. There 

 appears to be no reason why I should make valuable orig- 

 inal records public property until such time as I have fin- 

 ished my own analysis of them. If Professor Castle will 

 examine my published papers he will find that in lines of 

 work which I am finishing and leaving, complete raw data 

 are published (cf. for example "A Biometrical Study of 

 Egg Production in the Domestic Fowl," Parts I to III). 



In the second place I wish to say that so far as any 

 question of concealment is concerned Professor Castle, or 

 any of his students, will be very welcome to come to the 

 laboratory at any time, for as long as they like, and make 

 any examination of the original record books in connec- 

 tion with published results and conclusions. 



There is one further point which needs consideration 

 concerning the charge of suppression of pertinent facts. 

 An important reason, I think, why Professor Castle's own 

 interpretation of his rat selection experiment has not been 



