the twenty-six dissertations on materia raedica, six are 
missing; of the sixteen dissertations on natural history, 
seven are missing; of the eighteen economic dissertations, 
four are missing; and of the thirty-four medical disser¬ 
tations seventeen are missing• 
It is clear from the above summary that the botani¬ 
cal dissertations are best represented in this country, 
only two being lacking out of a total of sixty-three; the 
medical dissertations are most imperfectly represented, 
since seventeen out of thirty-four, or exactly one-half, 
are wanting. 
The zoological dissertations are also very imper¬ 
fectly represented in American libraries since fourteen 
out of a total of twenty-nine are wanting. 
The present list amounts to a provisional check list 
of the Linnean dissertations. It is hoped to make a 
second edition of the list that will include all the 
Linnean dissertations in the original editions to be 
found in American libraries. All librarians and others 
interested are requested to send to the undersigned notes 
concerning dissertations not here reported. 
In order to make the list more useful for reference, 
an index has been prepared to the titles of the disser¬ 
tations, as in some cases they were changed when the 
reprints were made. 
