(Vou. 8 
340 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
The writer takes pleasure in acknowledging his indebtedness 
and extending his sincere thanks to Doctor B. M. Duggar for 
suggesting and directing the problem and for kindly criticism 
and advice throughout its prosecution; and to Doctor George 
T. Moore for the privileges and facilities of the Missouri Botanical 
Garden. 
Graduate Laboralory, Missouri Botanical Garden. 
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