84 



White. 



it is hardly probable in a crop so closely attended and scrutinized as 

 is tobacco, and with so prominent a change in character as the original 

 mutant showed, that additional abnormal plants would have escaped 

 unnoted. The heterozygote (Aa) produces plenty of seed under even 



:'..^^k^;'- 



Fig. 10. Fasciated Nicoliana plants growing under shade 

 in Connecticut. 



unfavorable conditions, so its scarcity would not account for the presence 

 of only one plant. So many mutations are coupled with maturation 

 phenomena at the present time that it seems worth while to call 

 attention to cases that one may feel tolerably certain did not arise as 

 a consequence of reduction or maturation phenomena disturbances. 



The morphological differences between the normal Cuban (402) and 

 the mutant (300 — 309) which constitute the somatic character called 



