Eugene Dietzgen Co. 162-166 W. Monroe St. CHICAGO Engineering and Surveying Instruments Drawing Materials Send for 10th Edition Catalog ENGINEERING and CONTRACTING HALBERT P. GILLETTE, Editor THE FOUR ROTATED SPECIAL MONTHLY ISSUES and the 4 special quarterly issues of E. & C. (52 in all), entirely cover the civil engineering and contracting field if subscribed for as a weekly at $4.00 a year; but any one of the four special monthly issues may be subscribed for as a monthly at $1.25 a year (or any two monthly issues at $2.00 a year) and the four special quarterly issues will be sent without extra charge. These special quarterly issues relate entirely to foreign engineering and construction practice. The articles in the first two issues of each month (first and second Wednesdays) completely cover the municipal engineering and contracting field. The articles in the first and last issues of each month (first and fourth Wednesdays) completely cover county engineering and highway engineering and contracting. The articles in the third and last issues of each month (third and fourth Wednesdays) completely cover steam and electric railway location, design and construction. Address 610 South Dearborn Street, Chicago, Illinois SOLVAY CALCIUM CHLORIDE Solvay Calcium Chloride is a clean white chemical salt. It dissolves readily when exposed to air. It is odorless, colorless, and without effect on rubber. Easily applied. When applied to a road it soon becomes incorporated with the top course and absorbs sufficient moisture from the air to lay the dust and keep the surface smooth and compact. Saving the surface saves the entire road-bed. EVANS & WING, Inc. CHEMISTS AND TESTING ENGINEERS Specialists on CEMENT TESTING, MUNICIPAL and HIGHWAY materials of construction Department for the CHEMICAL and BACTERIOLOGICAL examination of WATER Equipped for general CHEMICAL ANALYSIS and PHYSICAL TESTS Olsen Universal Testing Machine, 300,000 pounds capacity Geological Survey of Michigan A catalog of State Survey reports, publications, and maps with a list of publications of the U. S. Geological Survey relating to Michigan will be sent upon request. Attention is called to recent publications as follows: Publication 26, Agaricaceae (Fleshy Fungi, of Michigan. Publication 29, Mineral Resources of Michigan for 1918. Orders for Topographic Sheets (Joint Survey) and inquiries as to what sheets are published will receive prompt attention. R. A. SMITH, State Geologist LANSING, MICHIGAN |