REVIEWS—ACADIAN GEOLOGY: SUPPLEMENTARY CHAPTER. 19] 
perfect condition of the solitary example on which it is based, scarcely 
warrants us to accept it, at present, otherwise than provisionally. 
In bringing to a close, this rapid notice of Professor Hall’s valuable 
contributions to paleontological science, as contained in the Report 
before us, we may congratulate our readers, who may be interested in 
this subject, on the near completion of the author’s third volume of 
the Paleontology of New York. In this volume we are promised, in 
addition to much important matter regarding various fossil groups, 
some new and interesting details on the structure of Hurypterus and 
other crustaceans of a similar type. These details, it is stated, are of 
a far more complete character than those hitherto educed from Euro- 
pean examples. E. J. ©. 
Supplementary Chapter to Acadian Geology. By J. W. Dawson, 
LL.D., F.R.S., Principal of McGill College, Montreal. 
Edinburgh: Oliver and Boyd. Montreal: B. Dawson and 
Son. 1860. 
The Acadian Geology of Dr. Dawson, a very elaborate treatise on 
the geological structure and characteristics of New Brunswick and 
Nova Scotia, published in 1855, was brought before the notice of our 
readers in an early Number of the Journal.* In the present ‘‘ Sup- 
plementary Chapter’ to this work, the author embodies the various 
discoveries and deductions, relating to the geology of these districts, 
which have accrued, since that time, from his own researches and 
those of other laborers in the same field. In this manner, the 
modern and Post-Pliocene deposits of Nova Scotia are briefly discussed 
and compared with those of Canada and Europe ; and a succinct but 
very able review is given of the Coal Measures, with their vegetable, 
reptilian, and other remains. The illustrations presented in connection 
with the author’s views on the structure of the Sigi//ari@ and other 
Carboniferous plants, are particularly interesting. All the new facts 
gleaned from recent examinations of the Silurian and Devonian strata 
of these provinces, are also brought together in a separate chapter, 
presenting as complete a view of the subject as the present state of 
our knowledge will admit. Dr. Dawson’s valuable Supplement, there- 
fore, regarded even as a separate work, will be found of the greatest 
service to all engaged in the study of American Geology. 
E. J. C. 
* Vol 1. New Series, p. 39—48. 
