Reviews—Haughton’s Manual of Geology. 449 
basalt and basaltic lavas. ‘The presence of water, an intense pres- 
sure, and a far more gradual cooling, all of which we are unable to 
imitate successfully, probably suffice to explain the total difference 
in the structure of the natural and the artificial products. At the 
same time,’ adds Mr. Sorby, ‘ the making of such experiments, and 
the microscopical examination of the resulting masses, are likely to 
lead to a far better knowledge of igneous rocks than we at present 
possess. —T. R. J. 
REVIEWS. 
: ———— 
T. Manuat or Grotocy. By the Rev. S. Haueuron, M.D., F.R.S., 
&c. London: Lonemans, GREEN, and Co. 1865. 8vo., pp. 360. 
FN 1862, Prof. Haughton had a reporter to take down a literal 
and verbatim report of a course of lectures on Geology, and 
these he now, without alteration or emendation, publishes as a Manual 
of Geology. Has the science been standing still during that period ? 
Was there nothing to add or to alter in 1865, to the prelections of 
1862? But, granting that by some mysterious second-sight the Pro- 
fessor did foresee the recent discoveries—that he conjured up the 
strange spectre of the Archzopteryx, and clearly saw the Laurentian 
Eozo6n, we scarcely think that the very words of a lecture to a 
class are likely to be the best for a manual for the student’s private: 
study. The hasty composition, the vague statements, and the rough- 
and-ready illustrations which necessarily belong to the extempore 
discourse, are too apparent in every page of this volume. And we 
cannot divine what the dissertation on the structure of honeycomb, 
with the history of the various opinions relative thereto from 
Pappus downwards to Haughton, has to do with an exposition of 
Geology. It would be unfair, however, to the learned author, were 
we not to add, that the student of Geology will find many things 
worth his careful attention in this volume. For instance, many will 
prize the volume because it contains a reprint of Prof. Haughton’s 
translation of Durocher’s important essay on Comparative Petro- 
logy. Our great regret, however, is, that Prof. Haughton, instead 
of producing a really valuable manual, in which he could have 
incorporated many of his original and useful observations and gene- 
ralizations—a work that would be deserving a place alongside of the 
admirable volumes of Prof. Green on the Protozoa and Celenterata 
in the same series—has satisfied himself with sending to the press 
the reporter’s version of his extempore lectures. 
IJ. Icz-caves or FRANCE AND SWITZERLAND. A NARRATIVE OF 
SUBTERRANEAN EXPLORATION. By the Rev. G. F. Brownz, M.A. 
London: Lonemans, GREEN, and Co. 1865. Pp. 315. 
HE desire for novel adventure which urges the members of the 
Alpine Club up the sides of virgin mountains, has led Mr. 
Browne to acquaint himself with eternal ice in the dark recesses 
of natural Glaciéres, where more gains to science may be expected, 
and less danger to limb demanded. Very little was known about 
VOL. IIl.—NO. XVI. GG 
