Correspondence. -tOO 
J. C. Branner: Some features of pre-Glacial drainage in Michigan. E. 
H. Mudge. 
IV. Excerptn and Individual Ptddlcations. 
The mineral wealth of Canada, a guide for students of economic ge- 
ology, Arthur B. Willmott. vi and 201 pp.; Wm. Briggs, Toronto, 1897. 
On the continental elevation of the Glacial epoch, J. W. Spencer. 
British A. A. S., Sec. C. Toronto, 1897; 2 pp. 
Geology of Polk county (Iowa), H. F. Bain. Iowa Geol. Survey, vol. 
7, pp. 263-412, pis. 7-9, 2 maps, 1897. 
Geology of Johnson county (Iowa), Samuel Calvin. Ibid., pp. 33-116, 
pis. 3-4, 2 maps, 1897. 
On the occurrence of fossil fishes in the Devonian of Iowa, C. R. East- 
man. Ibid., pp. 108-116, pi. 4, 1897. 
Our local geology, W. H. Barris. Proc. Davenport Acad. Nat. Sci., 
vol.7, 19 pp.. 1897. 
The Batesville sandstone of Arkansas, Stuart Weller. Trans. N. Y, 
Acad. Sci., 1897, pp. 251-282, pis. 19-21. 
V. Proceedings of Scientific Laboratories, etc. 
Mus. Comp. Zool., Bull., vol. 31, no. 1, pp. 19-44, pis. 1-5, Oct., 1897. 
Contributions to the morphology of the Turbellaria (II). W. M. 
Wood worth. 
CORPxESPONDENCE. 
The Seventh Intebnatioual Congress of Geologists. The last 
Congress held in St. Petersburg was cast in such heroic proportions and 
carried out with such consummate skill that it easily stands out as a 
colossus, overshadowing all the preceding six, and its description must 
follow one of two directions: either a general direction, which seeks to 
convey the aims and results of the entire meeting as a whole; or the de- 
tailed description of its many interesting i)arts, including, of course, in 
this idea the excursions undertaken before, during, and after the regu- 
lar business sessions. These latter, indeed, so far as relates to the con- 
sideration of business and the adoption of resolutions to govern the 
method of formulating the results of the researches of the world's geol- 
ogists formed little more than a name and excuse for the gathering. 
Here again the idea, more or less developed at previous sessions, of pre- 
senting sjjecial collections of cartography, publications, and specimens, 
was so largely extended that the hall of display was the equal of many 
museums in the number and variety of objects, and the superior of 
most museums in the present interest of the objects displayed. 
The discussions were neither better nor worse than those of antece- 
dent sessions, though perhaps their hollow character as a means of 
establishing anything was never more apparent. At the general ses- 
sions, or those at which the vote expressing the sense of the Congress 
was taken, it was always evident that the nature of the vote had been 
