214 The American Geologist. Marcii,i897 
copper, $33,lil,142; building stone, $37,377,816; petroleum, $35,522,095; 
and natural gas, $13,954,100. The production of iron was (5,657,388 long 
tons, or an average of 200 pounds apiece for each man, woman and child 
of our population. 
The compilation of these reports and statistics has been carefully done 
by many specialists under the direction of Dr. Day. It is a great ad- 
vantage to the industrial interests of the United States that his reports 
be promptly published, as early as is consistent with their accuracy and 
completeness. The promptitude of issue of the present volumes there- 
fore deserves most hearty commendation. It is further to be hoped that 
similar early publication and distribution will be accorded likewise, so 
far as shall be practicable, to the other work and investigations of the 
survey, embodied in its bulletins and monographs. w. u. 
The Geology of the Fox Islands, Maine: A Conirilmtion to the Stndif 
of Old Volcanics. A dissertation submitted to the Board of University 
Studies of the Johns Hopkins University for the degiee of Doctor of 
Philosophy. By Gkorge Otis Smith. (76 pp., 2 pis.: Skowhegan, Me., 
1896; published by the author.) The Fox islands are situated in about 
the center of Penobscot bay, eight miles out from the mainland. North 
Haven and Vinal Haven are the principal islands of the group and a- 
mong the larger of the many islands along the Maine coast. Their most 
striking topographic feature is an extremely sinuous coast- line. Dr. 
Smith says that, while a circumference of thirty miles would encompaes 
the entire group, the coast-line of these two islands alone measures near- 
ly one hundred and fifty miles. This feature is due to the depression 
of a surface diversified by subaerial erosion and only slightly modified 
by glaciation. Wave action is reducing the complexity of the coast-line, 
cutting back the salient and filling in the re-entrant angles of the coast. 
Thus an increasing simplicity will accompany and indicate the increas- 
ing age of the coast-line. 
The geological research of Dr. Smith has been along three lines: the 
investigation of the geologic relations of the different members of the 
rock series, the determination of the original nature of the rock-types 
represented, and the tracing of subsequent changes. With the results 
of this three-fold research thoroughly mastered, he is able to give an 
admirably cleai* outline of the geologic history of the islands. 
There are seven geologic formations repre.sen ted, comprising a consid- 
erably larger number of rock-types. 
The North Haven greenstone complex covers the greater part 
of North Haven and is composed of diabases, amygdaloidal and com- 
pact, with accompanying pyroclastics. From this original material 
greenstones have been produced through the processes of saussuritiza- 
tion and chloritization chiefly. A columnar structure, conspicuous in 
the field, is thought to be due primarily, to contraction on cooling, and 
.secondarily, to modification by subsequent dynamic action. The prisms 
produced by contraction have been rounded and a schistose matrix 
formed by dynamic action. This greenstone complex bears internal 
