SIXTH ANNUAL REPORT OF THE DIRECTOR. 15 
be correctly and legibly named. The enamel (granite 
ware) tree labels which were at first tried have not proved 
satisfactory, for several reasons, and trees of sufficient size 
are now receiving zinc alloy labels cast with raised letters, 
and affixed by two pins in a vertical line, so as to admit of 
the expansion of the tree during growth. For the smaller 
plants, celluloid labels, lettered with a special ink, have 
been employed very largely, and present a neat appearance 
when wired to the plants or fastened before them; but it 
has thus far proved to be impossible to letter them so as to 
insure permanency, and experiments are being tried in the 
hope of securing labels combining durability and attractive- 
ness with reasonable cost. 
The herbarium has been increased by the incorporation 
of 9,307 sheets of specimens, of which 3,567 sheets were 
purchased, 126 belonged to the Bernhardi herbarium, and 
5,614 were received by donation or exchange. 208 mounted 
sheets of duplicates from the Engelmann herbarium, and 
12 mounted duplicates from the general herbarium, besides 
about 1,000 unmounted duplicates, have been distributed 
to correspondents by way of exchange. As now consti- 
tuted, the herbarium contains the following collections :— 
The Engelmann herbarium (all groups), about........ 97,800 specimens. 
The general herbarium of higher plants: 
The Bernhardi herbarium.........eeesseeses 61,120 
Other SPpeCiMEDS.....- ceeccecccceecceecececs 54,687 
115,807“ 
The collection of Thallophytes :— 
The Bernhardi herbarium.........+ssseseeses 126 
Other specimens.......cecccsscccccccccccvce 17,794 
17,920 « 
Making a total of about.... ..-.--.eseeeeeeeeee 231,527 a 
During the year $1,720.11 was spent for purchases and 
binding for the library, the additions to which consist of 
873 books and 166 pamphlets purchased, and 379 books, 
valued at $733.95, and 999 pamphlets, valued at $207.65, 
