PLATE 10. 



B 



A. Raimannia and iiuluced derivatives. The three rows of plants in the background include some large 



normal individuals and small mutants grown from seed taken from a capsule which had been treated 

 with calcium nitrate. The remainder are mutants of the second generation. 



B. Individuals grown from seeds taken horn one capsule. The large rosette is of the parental type, the 



smaller are derivatives, two of which have come into bloom at the same age and are scarcely so high 

 as the normal rosette. 



