OENOTHERA MUTANTS WITH DIMINUTIVE CHROMOSOMES 52 1 
In the spring of 191 3 Professor de Vries very kindly provided me 
with seeds of the Amsterdam mutant. These were sown in March 
Fig. 6, Type 3514, plant No. 3514, C. S. H., 1908. Mutant offspring of 0. 
Lamarckiana. Supposed to be a modified form of de Vries's rubrinerois. Photo- 
graphed during early flowering period. 
of that year, but owing to drought, late transplantation and a de- 
structive attack of aphids, which showed a curious preference for 
