430 



RUTH J. STOCKING 



We have therefore in race A a group of individuals all de- 

 scended by vegetative reproduction from one animal, exconju- 

 gant lb, which for 74 generations and 131 days constantly pro- 

 duced abnormals in an average proportion of 56 per cent of all 

 the individuals of the race. From this clone, having this herit- 

 able character, abnormality, were obtained through the action 

 of selection, two diverse groups of individuals. One group had 

 a constant proportion of abnormality, on the average, of 70 per 

 cent; the other with almost total normality, the abnormality 

 having been reduced to an average of 1 per cent; all of the lines 

 were entirely normal for some time before they died out. In 

 this clone therefore we have an inheritance of a variation, abnor- 

 mality; and also we have permanent changes in this heritable 

 variation, brought about by the action of selection. 



TABLE 12 

 Data from fourteen groups of Race B 



The history of race B shows some slight variations from that 

 of race A. Its early history is shown in chart 7. It was en- 



