Xo. 642] VARIATION IN DATURA 



23 



provisionally called these mutants the 12 apostles. Cer- 

 tain of the 12 have varieties which may be called acolytes, 

 and perhaps some of these in the figure may be reduced 

 from the rank of apostles to that of acolytes when other 

 forms are discovered. 



f ^ « 

 f # • 



In Figure 5, the mutants from which the capsules in the 

 lower row were taken have been provisionally classed as 

 acolytes of their respective apostles represented above. 

 The evidence is best in regard to the mutants Wiry and 

 Poinsettia which form the pair at the left in the figure. 

 They both contain a single extra chromosome of approxi- 

 mately the same size, and in both cases this extra chromo- 

 some is shown, by peculiar color ratios in their offspring, 

 to be in the set which carries the factors for purple and 

 white flower color. The fact that though perfectly dis- 

 tinct they are yet similar in appearance, and the fact that 

 one has not infrequently given rise to the other in our 



