382 Scientific Intelligence. 
given line would, by destroying the equilibrium ot pressure, cause 
the somewhat flexible crust to subside ; the lower strata becom 
in the earth’s crust, and thus determine the contraction which 
results from the cooling of the globe to pories itself in those 
which determines their position and direction, by making the 
effects produced by the contraction, not only of sediments, but of 
the earth’s nucleus itself, to be exerted along the lines of greatest 
accumulation.” 
Professor Hunt is therefore entitled to the credit ~~” in a 
place mentioned to Professor LeConte. - D. 
2. United States Geological — of the Territories ba vile 
Department of he _ y FB. Haypen, United States Geol- 
1887, 1868 and 1869, This is a reprint of these reports, in order 
that the series, now in much demand because of its intrinsic value, © 
may be accessible from its beginning to the public. The survey 
commenced in 1867 i in Ne ae on an appr opriation of $5,000, 
was continued in 1868 in Wyoming, on a like sum; and was 
extended in gt to Grhovade a New Mexico on an ‘appropria- 
tion of $10,00 
(2.) Of the five volumes of Reports in quarto of the same expe 
dition which are in progress, there have appeared Part 1 of Vol II, 
extending to 358 pages, and including thirty-seven plates,—on 
Fossil Vertebrates, by Dr. J. Lerpy; and part of volume V, mee 
oa, dome 262 pages, treating of the Acridide or Grasshoppers, ! J 
Dr. 8 Tuomas. The wonderful character of the terrestria 
to its companion, in course sp peovieitian: oy tk , Cope. 
Leidy has here presented. in detail, and with fall illustrations, 
descriptions of s ecies from the collections of the survey an os ed 
er sources, which have appeared, in brief, mainly in the ‘is 
ceedings of the Philadelphia Academy. Dr. Le idy refers Mar a 
Dinoceras to his own earlier genus rite na stating that 
differences are too slight for generic distinctio ame 
In addition to Mammals, the volume oonkale descriptions 
various species of fossil reptiles wert fishes, wit 
Dr. Thomas’s work is a general synopsis with description “ae 
the Acridide of the United aie and also of those of 
