14 



Pearl and Bartlett. 



to be the case, there is no close relation between the crude fat content 

 and the general complex of the physical and chemical characters which 

 give the kernels their characteristic external appearance as either 

 starchy or sweet or yellow or white. The same sort of relationship 

 is to be observed in the protein content, although there the differences 

 are not so marked as in the case of the fat content. 



Ash. The evidence that there is a segregation in Fg in respect 

 to ash content is quite as clear as with reference to any of the other 

 characters, though again ash content is not in any way closely or 

 directly related to the complex of physical and chemical characters 

 which together give a kernel of maize the external attributes of 

 "sweetness" or "starchiness". An interesting and noteworthy fact 

 in connection with the ash content is that all of the cross-bred samples, 

 whether in Fi or in Fo, run lower in ash content than the correspon- 

 ding one of the parent forms. The explanation of this general diminution 

 ill ash content will appear as we proceed. 



Crude Fiber. Here the evidence of segregation in Fo is again 

 quite clear. "High fiber" is the recessive character and it is remarkable 

 how closely the "high fiber" segregates in F., agree with the original 

 "high fiber" parent. In the classes showing the dominant (low fiber 

 content) character in F.j it is to be noted that there has been a con- 

 siderable reduction in fiber content below that of the original "low 

 fiber" parent. We seem to have here something like the "intensi- 

 fication" of the character through segregation, which will be discussed 

 more particularly in connection with sugar content. The chief diffe- 

 rence is that here it is the dominant character which appears to be 

 "intensified" whereas in the case of sugar it is the recessive character. 



Pentosans. Here the evidence of segregation is unmistakable, and 

 is made more evident through an apparent "intensification" of both 

 the dominant and the recessive characters. That is to say, the "low 

 pentosan" classes in Fg have a lower content in this class of carbo- 

 hydrates than the original "low" parent and at the same time the 

 "high pentosan" classes have a higher content than the original "high" 

 parent. It is further to be noted that the dominants in F2 agree 

 very precisely with the Fj kernels in respect to pentosan content. 



Sugars. The facts with reference to sugar content of the Fg 

 kernels are of especial interest because these are the characters which 



