112 
THE ^CIENIIST. 
ment of the institute. "The cement test," 
"Tests of iron and steel," "Preservation of 
timber'" and many ocher articles make it 
well worth th • price, 50 cents. Engineers, 
contractors and builders will find much 
valuable information in them which could 
^lot be gained by individual experiments 
without great expense for the necessary ap- 
pliances used as well as loss of time required 
to make such tests. 
The following volume, relative to the con- 
struction and maintainance of roads, has 
been received, the title page of which will 
give a very correct impression of the contents 
and value of the book: "A move for better 
roads, essays on road making and main- 
tainance and road laws, for which prizes or 
honorable mention were awarded through 
the University of Pennsylvania by a com- 
mittee of citizers of Philadelphia, with a 
synopsis of other contributions and a review 
by the secretary, Lewis M. Haupt, A. M., 
C. E. professor of civil engineering. Uni- 
versity of Pennsylvania, also an introduc- 
tion by William H. Rhawn, chairman of the 
committee," 
This volume is recommended for reference 
to all who are interested in road-making and 
maintainance. 
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