302 Bibliography. 
same observed to prevail so extensively farther north by Major Long, 
was the rock in the vicinity of Purgatory creek, and along the Ca. 
nadian in latitude 36°. The beds were nearly horizontal and highly 
ferruginous, and occasionally much intersected by seams of i The 
rock forms high bluffs, bounding the valley of the Purgatory ; numer- 
ing wildly over a succession of rocky ledges. The water of the re- 
gion was in standing pools, generally impregnated with common salt 
and other salts, rendering it nauseous and bitter to the taste. From 
latitude 361° to 36°, on the Canadian, there were bluffs of shale. Be- 
low this they passed to the soft brown sandstone again, and then toa 
ed sandstone of a bright red color, which, in longitude 103°, was over- 
laid by a limestone. Pools of salt waters were here met with; and 
brilliant display of crystals above. The plains were strewed with 
coarse agates. 
P 5 Chloris Boreali-Americana : Illustrations of new, rare, or other- 
wise interesting North American plants, selected chiefly from those re- 
cently brought into cultivation at the Botanic Garden of Harvard Uni- 
versity ; by Asa Gray, M. D., Fisher Professor of Natural History in 
Harvard University. Decade I. (From the Memoirs of the American 
propose at this time merely to call attention to the preface, publ : 
t year with the 9th and 10th fasciculi, and to express unqualified 
admiration of the manner in which a subject of interest to all naturalists; 
of nomenclature, is there treated: While botanists are enjoying 
the benefits of a sedulous adherence to the wholesome rules im 
by the father of natural history nomenclature, and of nearly unanimous 
agreement in the few changes. which the progress of science and the 
multiplication of its objects have rendered needful, the zoologists on the 
