Correspondence. 
253 
School of Mines Quarterly, Jan. Lecture notes on rocks, J. F. Kemp. 
Am. Naturalist, Mch. The history and principles of geology and its 
aim, J. C. Hartzell, Jr.; Life before fossils, Charles Morris; On the oc¬ 
currence of Neocene marine Diatomaceae near New York, A. M. Ed¬ 
wards. 
IV. Excerpts and Individual Publications. 
The physical features and geology of the route of the proposed Ot¬ 
tawa canal between the St. Lawrence river and lake Huron, R. W. Ells 
and A. E. Barlow. Trans. Roy. Soc. Canada, 2d ser., vol. 1, sec. 4, pp. 
163-190, map, 1895. 
Geological history of the Chautauqua grape belt, R. S. Tarr. Cor¬ 
nell Univ. Agrl. Exp. Station, Bull. 109, pp. 90-122, 1896. 
Ueber Lawsonit, ein neues gesteinsbildendes Mineral aus Californien, 
F. H. Ransome and Ch. Palache. Zeitsch. f. Krystallog., Bd. 25, pp. 
531-537, pi. 7, 1896. 
The Saint Peter Sandstone, F. W. Sardeson. Bull. Minnesota Acad. 
Nat. Sci., vol. 4, no. 1, pp. 64-88, pis. 2-4, 1896. 
Life, Letters and Works of Louis Agassiz, Jules Marcou. 8vo, 2 vols. 
xi-f-302 and viii+318 pp.: New York, Macmillan and Co., 1896. Price $4. 
The LeClaire limestone, Samuel Calvin. Bull. Lab. Nat. Sci. State 
Univ. Iowa, vol. 3, no. 4, pp. 183-189, 2 pis.; March 16, 1896. 
V. Proceedings of Scientific Laboratories , etc. 
Bull. Sci. Labor. Denison Univ., vol. 9, pt. 2, Dec., 1895. The Paleo¬ 
zoic formation. W. F. Cooper; Preglacial and recent drainage channels 
in Ross county, Ohio, Gerard Fowke; A preglacial tributary to Paint 
creek and its relation to the Beech flats of Pike county, Ohio, W. G. 
Tight. 
Bull. Dept, of Geol. Univ. of Cal., vol. 1, no. 12, pp. 337-362, ph 18, 
Mch., 1896. Onmalignite, a family of basic plutonic orthoclase rocks 
rich in alkalies and lime, intrusive in the Coutchiching schists of Pooh- 
bah lake, A. C. Lawson. 
CORRE SPON DENCE. 
Preliminary Notes on Studies of the Great Lakes made in 1895. 
The work of exploring the coastal slopes of the Great Lakes with a 
view of studying their glacial and postglacial history was resumed 
about the middle of June of last year and continued at intervals until 
the end of October. Some of the regions visited were critical, that is 
to say, they might reasonably be expected to yield results that would 
be decisive in their bearing on certain questions that have been more or 
less in controversy. I offer the following preliminary notes on some of 
the more important results and a few remarks on their relations to 
views previously expressed. 
About five weeks were spent in exploripg the coasts of the lower pen¬ 
insula of Michigan. The ground covered extends from the west side of 
Saginaw bay northward to the Strait of Mackinac and southward on 
the coast of lake Michigan from Mackinac to Manistee. The results of 
