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many gardens, and to correct errors. Numerous gardens that re- 
plied not at all or only meagerly or carelessly to our first question- 
naire have supplied fuller and more carefully prepared informa- 
tion for the second edition. Undoubtedly there are still omissions 
—many gardens have made no reply to questionnaires and letters 
—and in all likelihood there are errors. It may be stated that all 
data follow faithfully the information as supplied by the gardens 
themselves, and have been carefully checked against the question- 
naires returned. One despairs, however, of attaining accuracy 
when, for example, dates supplied by the person concerned are 
not the same as the corresponding dates supplied by the same per- 
son in American Men of Science. That has been the case in more 
than one instance. 
In general, botanical “institutes” and institutions for botanical 
research are not listed unless they include a botanic garden. In 
reply to two or three letters received concerning the first edition, 
it may be emphasized that this work is not intended merely as a 
guide to existing botanic gardens, as they now are, but as ma- 
terials for a history of botanic gardens, existing or no longer 
existing, and thus as a contribution to one of the most important 
phases of the history of the organization and administration of 
botanical science, from the time of Aristotle to the present. 
A request for information, with questionnaire blank, has been 
sent (in most cases more than once) to every existing garden 
listed in the following pages. Meagerness of information means 
either that no more was supplied by the institution or that no 
reply was received. 
In such matters as official names of institutions, mail addresses, 
spelling of place names, etc., the author has adhered strictly to the 
data as supplied by the institutions, without attempting to edit for 
uniformity. Quotations not otherwise credited are from returned 
questionnaires. 
The original data received from the various gardens are on file 
for reference in the Library of the Brooklyn Botanic Garden. 
The author will, as before, be glad to be advised of any errors 
or omissions noted by those consulting the work. He is also happy 
to acknowledge the continued cooperation of Miss Marie Louise 
Hubbard, who did all the work in preparation of the final manu- 
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