Dichromatism in Lina Lapponica. 



129 



In Table VI we observe the progeny in matings a and h only 

 breeding true to parentage. Consequently in Table VIII the only 

 crosses answering to Mendelian conditions are crosses a and b, 

 crosses between individuals of two differentiating characters S 

 and B, each of which presumably breeds true to its kind. In the 

 progeny of these crosses we observe typical Mendelian results, 

 namely, each cross produces offspring like one parent only, the 

 S parent, regardless of whether S is a male or a female character. 



Table VI — SxS Parents. SxS Grandparents. 



While cross h gives a Mendelian result we cannot say that it 

 entirely answers Mendelian conditions, since as shown in Table 

 VI, c and ^, S 112 may or may not have been a pure Mendelian 

 dominant. If we interpret the results as typically Mendelian we 

 must look upon S 119 in Table VI as representing hybrids and 

 influencing the offspring in S 119 X S 112 crosses. The results 

 of crossing S 119 X B 154, Table VIII, are in harmony with this 

 interpretation. 



Having no other pure S broods of similar ancestry than those 

 of fl and b. Table VIII, these broods were left unmated, and conse- 

 quently the fate of the S and B characters is unknown; that is, as 



