Geology and Mineralogy. 347 
4, Missouri Geological Survey—Lead and Zine Deposits, by 
ARTHUR WINSLOW, assisted by James D. Robertson, vols. vi 
and vii, pp. i-xx1, 1-763, plates i-xli, figures 1-268. Jefferson 
City, Mo., 1894.—The importance of the lead and zinc industry 
in Missouri is full justification for the preparation of this ex- 
_haustive treatise on lead and zine deposits, by the geological sur- 
vey of that state. The construction of the report follows the 
general lines of the admirable manganese report of Dr. Penrose, 
published by the Arkansas survey. The first part (pp. 1-507) is 
a summary account of the history, compounds, modes of occur- 
rence and distribution of lead and zinc throughout the world, the 
final chapter of which, on the industries and statistics of lead and 
zine, was written by Mr. Robertson. Although this part is chiefly 
a compilation, with its accompanying bibliography and frequent 
reference to sources, it will be of much value to the student as 
well as to the investor. The remainder of the report is devoted to 
an account of the history of mining in Missouri, the physiography 
and geology of the mines, and a detailed description of the sey- 
eral ore deposits and mines distributed throughout the state. 
The investigations, which led to the writing of the report, were 
begun in 1889 in codperation with the United States geological 
survey, whose representative, Dr. W. P. Jenney, collected a large 
body of facts illustrating the subject. Mr. Robertson of the 
state survey cooperated with Dr. Jenney in these investigations 
and was a co-worker with Mr. Winslow in the preparation of this 
final report. 
Although communicated to the board of managers by Mr. 
Keyes, the report was planned and executed entirely by the late 
State Geologist, Mr. Winslow, who is to be congratulated upon 
the production of a work which brings together, in such orderly 
and satisfactory form, the knowledge up to date regarding the 
distribution and mode of occurrence of these mineral products. 
The author’s theory of the origin of the metalliferous minerals 
in the ore bodies is, briefly, that they were introduced into the 
cavities where they have been mined, “in solution,” and that the 
source of these solutions was “original diffusion through the 
country rocks, and subsequent concentration through surface 
decomposition of the latter, supplemented by percolating waters.” 
H. 8. W. 
5. Geological Survey of Canada.—The Annual Report for 
1892-93 has appeared. It contains, besides the usual summary 
reports of work done in the years 1892 and in 1893, two strictly 
geological reports, viz: “ Preliminary Report on the Geology of 
a portion of Central Ontario,” by Franx D. Apams, and “ Prelim. 
Report on Geological investigation in Southwestern Nova Scotia,” 
by L. W. Bartzy. There are also “ Chemical contributions” by 
G. Cu. Horrmann and his assistants, and “ Mineral Statistics and 
Mines” for 1892 by E. D. Ineatt and his assistants. (Geol. Surv. 
Canada, A. R. Selwyn Direct., Aun. Rept. (new series), vol. vi, 
Repts. A (1892), A (1893), J, Q, R, S, 660 pages, Ottawa, 1895.) 
