PREFACE 



Of the four papers contained in Volume VII of the Memoirs of The 

 New York Botanical Garden, the two lonojest, the first and the third, have 

 been provided with individual indices. It is hoped that the tables of con- 

 tents that introduce the two shorter papers will, in a large measure, take 

 the place of sejjarate indices for those contributions. 



The editor gratefully acknowledges the assistance of Dr. John Ilend- 

 ley Barnhart and the cordial cooperation of the four authors. 



Marshall A. Howe, 

 Editor. 



