122 The Americafi Geologist. February, 1900 
the first edition, which is certainly the more convenient arrangement. 
In the compilation of such a large mass of data it becomes almost 
impossible to eliminate all errors. At the same time one can but wish 
that a book which is used as much as this one is, should be practically 
fret- from errors. In looking over the altitudes of places in Minne- 
sota the reviewer notices certain errors and omissions which, in the 
work of compilation, ought to have been avoided. The elevations of 
certain points, mostly lakes, are given from barometrical determina- 
tions made by the Geological and Natural History Survey of Minne- 
sota in 1878 and 1879. Many of these elevations were later (1893) 
determined by levelling and by careful series of barometer readings, 
and the revised elevations were published in the Twenty-second An- 
nual Report in 1894. The present Bulletin gives the earlier determina- 
tions and not the later more accurate ones. The elevations of a num- 
ber of the important mining towns in northeastern Minnesota are 
omitted, although on railroads which possess profiles and although 
these elevations have been published in the above mentioned report. 
U. S. G. 
Granites of Southern Rhode Island and Connecticut, with observa- 
tions on Atlaiitic Coast Granites in General. By J. F. Kemp. (Bull. 
G. S. A., vol. X, pp. 361-382.) 
The granites described in this paper are all biotite-granites, and 
though four types are distinguished — Westerly and Stony creek red 
and gray granites (a "Lyme pink" porphyritic granite is mentioned 
but not described) — they differ but slightly, the gray types being very 
fine-grained, the red somewhat coarser. The nature of the contact 
at numerous places and the basic segregations and inclusions of 
gneiss and amphibolytes within the granites, show them to be erup- 
tives. Their age is not narrowly fixed. They are pre-Triassic, and 
may be as early as post-Cambrian; they cut granitic biotite-gneisses 
but have largely escaped the dynamic metamorphism Which has so 
profoundly altered the surrounding rocks. The granites are accom- 
panied by pegmatytes, which are without the abundance of accessory 
and sometimes rare minerals found in the pegmatyte dikes of cen- 
tral Connecticut. Comparison is made with Atlantic coast granites 
in general and it is shown that biotite-granites prevail through the 
whole region. L. G. w. 
Geological Survey of Michigan : Upper Peninsula, iSgj-iSgy. Vol. 
vi: Part I, Isle Royale, by Alfred C. Lane; Part II, Keweenaw point, 
with special reference to the felsites and their associated rocks, by Lucius 
L. Hubbard; The crystallization of the calcite from the copper mines of 
lake Superior, hy CnxKi.K'^. Palache. pp. 281, 184. Numerous plates 
and geological maps. Lansing, 1898 [1899]. 
This volume adds much to the accurate geology of the Northern 
Peninsula of Michigan. Dr. Lane gives a brief sketch of early min- 
ing and of recent explorations on Isle Royale, the latter comprising 
records, and drill-cores, of a large series of diamond-drilling at the west 
end. From these he constructs a cross-section of the Keweenawan 
