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Catalogue of Materials. 
We keep constantly on hand a full stock of Botanical paper of standard 
size and quality. 
This paper is the kind in use by all the Botanists in the United States. 
The standard of size was established by Dr. Asa Gray of the Botanic 
Gardens, at Cambridge, Mass., and is used in his own, and the Harvard 
Herbarium. The Genus Covers are of fine Manilla paper, well-calendered, 
so that the surface can be written upon if desired. The Dryers we 
have made specially for us, and we can confidently recommend them. 
Persons wishing to obtain books not found in our list are requested to 
send a list of them. We are in communication with parties who are de¬ 
sirous of disposing of a portion of their libraries, several of whom have 
among their duplicates, some very rare and important works in the 
various departments of Natural Science. 
Parties having Instruments, Books, Specimens, etc., which they wish 
to dispose of, are requested to communicate with the Bureau. We have 
extra facilities for the sale of such material and will advertise it thor¬ 
oughly. Our Quarterly, appearing as it does in an issue of 4000 copies, 
which are circulated among Scientific people all over the United States, 
offers an advertising medium unequalled in America. Parties wishing to 
exchange specimens will do well to apply to us, as we keep a list of ex¬ 
changers, and having on hand at all times a large stock of material and 
specimens in every department, are thus enabled to answer promptly all 
calls upon us in this direction. We have also reserved a page for the 
benefit of subscribers to the Quarterly. Persons having specimens for 
exchange can be supplied with space for a card in the Exchange Depart¬ 
ment. 
MOU1TIHG PAPER. 
Single Sheets. 
11 1-2 X 16 1-2 inches. 
Orders of less than 1-2 Ream .... 
“ “ one to three Reams, per Ream . 
“ “ four to seven “ “ “ . 
“ “ over seven “ “ “ 
Double Sheets, 
16 1-2 X 23 inches. 
Orders of one to three Reams, per Ream 
“ “ four to seven, “ “ “ 
2 cents per sheet. 
. $6 00 
5 25 
5 00 
. $10 50 
9 50 
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