140 BOTANICAL INFORMATION. 
plants of this region; and thus their collections may be ex- 
pected to prove unusually choice and valuable. 
The third collector, Dr. Lindheimer, a very assiduous 
botanist, intends to devote a few years to the exploration of 
Texas ; and he pledges himself to exclude from his sets all 
the common plants of the south-western United States. 
These several collections will be assorted and distributed, 
and for the most part ticketed, by Dr. Engelmann of St. 
Louis; assisted, where it is necessary, by the authors of the 
Flora of North America, who promise to determine the plants, 
so far at least as they belong to families published in that work; 
and for the information of subscribers, particular notices of the _ 
centuria offered for sale, will probably appear in Silliman's 
N. American Journal as they come to hand. The number of 
sets being limited, earlier subscribers will receive a prefer- 
ence. The three explorers are entirely independent of each 
other ; and their collections are to be separately subscribed for. 
The price of the Rocky Mountain collections of Geyer, or 
of Lüders, is fixed at ten dollars (or two guineas) per hun- — 
dred; that of Dr. Lindheimer's Texian collections at eight — 
dollars (or £1 13s. 6d. sterling) per hundred ; payable on 
delivery of the sets at St. Louis, Missouri, by Dr. George 
Engelmann; at New York, by Wiley and Putnam, 161, 
Broadway, and Stationers’ Hall Court, London ; and Pro- 
fessor A. Gray, of Harvard University, Cambridge, Massa- 
chusetts, to any of whom subscribers may address them-. 
selves (post paid) by mail. The additional expense of trans- 
portation, doubtless trifling in amount, will be charged upon 
the sets deliverable in London. : 
The writer of this notice (Dr. A. Gray) cheerfully states that 
the dried specimens made by these botanists, which have fallen 
under his observation, are well selected, very complete, and 
finely prepared; and he cordially joins Dr. Engelmann in 
recommending the enterprize to the patronage of botanists. - 
For the purpose of obtaining some immediate pecuniary 
aid in the prosecution of his present arduous undertaking; 
Mr. Geyer also offers for sale, through the parties above- | 
mentioned, a selection from his collections of the last year in 
