4. 
Thesaurus litteraiurae botanicae is given.1 
On the right-hand margin of the page, opposite the 
title of the dissertation, are found abbreviations for 
the names of libraries which contain original editions of 
Linnean dissertations. A list of these libraries with 
the corresponding abbreviations is given on the page 
marked "Directions for Use." 
In all, nine libraries in the United States are now 
known to contain original Linnean dissertations. The 
Library of Congress has ninety-nine, and in addition, ten 
duplicate copies; the New York Botanical Garden lias eighty; 
Dr. Barnhardt’s library has thirty; the Surgeon General’s 
library twenty-nine; Gray Herbarium twenty-three; Depart¬ 
ment of Agriculture library tivelve; John Crerar library 
twelve; Arnold Arboretum nine; and the library of Columbia 
University lias one. 
These nine libraries contain 305 copies of original 
editions of Linnean dissertations. Of these 1G7 are 
duplicates, leaving 138 different original dissertations 
out of a total of 186 that were published. 
Of the sixty-three botanical dissertations all but 
two are to be found in American libraries; of the twenty- 
nine zoological dissertations, fourteen are missing; of 
I ' 
Pritzel, O(eorE) A(ugust), Thesaurus literaturae botanicae ...? 
ed. Lipsiae (F. A. Brockhaus), \? T J2. 4°* (4)+i7^ PP« 
