6 Inheritance and Evolution in Ortlioptera It 



Explanation of the Tables. Matings of the same kind are grouped. The <? is ou the 

 left and the 9 on the right of the x, except when (R), which indicates a reciprocal, 

 is used. Beginning at the left, the (R), when used, equals a reciprocal ; the number in 

 heavy type (e.g. 3) is that of the mating; the next number, or numbers, indicate the 

 progeny; the last number, or numbers, in square type (e.g. 17) indicate the sources of 

 the parents, the c? being on the left and the ? on the right when two numbers are given; 

 (I in.) = from the cultures of the first instalment {Journal of Genetics, Vol. iii. p. 141); 

 (N) = from nature. The first line of totals gives the actual numbers and the second, in 

 italics, the expectation. 



AQ X BC 



18 



AB 

 12 



AC 

 10 



BQ 

 23 



CQ 



14 157 14 



Expect. 14-7 14-7 14-7 14-7 



AD X AD 



19 



Expect. 



AA AD 



12 

 16-7 



I 

 DD 



55 N 

 50-2 



