" NOTICES OF BOOKS. 391 
Memoir of a Tour to Northern Mexico, in 1846 and 1847, by 
A. WisrizENvUs, M.D., with three maps :—and a sketch of the 
Botany of Dr. A. Wistizenvus’ Expedition from Missouri to 
Santa Fe, Chihuahua, Parras Saltillo, Monterey, and Mata- 
moros, by Dr. ExGELMANN. Washington, 1848. 
The Tour itself is a very remarkable one, and made at a 
season during which it was not unaccompanied with difficulty and 
danger. The author's object was most praiseworthy : “ I desired 
to examine the geography, natural history, and statistics of the 
country ;” and his narrative is full of information on these heads. 
But what chiefly concerns the readers of our Journal is the Botan- 
ical collection, which Dr. Wislizenus wisely entrusted for publica- 
tion to our friend Dr. Engelmann of St. Louis ; and that gentleman 
has been able, in the appendix, to give a general view of the Flora 
of the regions traversed, and to describe some of the most inter- 
esting new plants. He would have done thus with the entire - 
collection, had he not been, in St. Louis, much cut off from 
access to large Herbaria and public libraries. The want of them 
will, no doubt, have occasioned some plants to be described as 
novelties which have elsewhere appeared in European works ; and 
this, we suspect, is especially the case with the Cactez, of which 
a very great number of species are stated to be new. Neverthe- 
less, this is a very valuable addition to our knowledge of the 
botany of a region of great interest (extending through 2,232 
English miles of country), and hitherto almost wholly unex- 
plored. 
—————— 
Descriptions of Plants, collected by Mr. WitziAM GAMBEL, in the 
Rocky Mountains and Upper California ; by Tuomas NUTTALL. 
(Extracted from the Proceedings of the Academy of Natural 
Sciences of Philadelphia.) 
We are glad to find the veteran Nuttall, so long identified with 
the botany of America, again engaged in his favourite pursuit of 
describing new genera and species of plants of N. America. 
VOL. VII. * Y 
