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be 
10. Report accompanying the Map of the extremity of Cape Cod, 
Mass., executed during portions of the years 1833, 1834, and 1835 ; 
by James D. Grauam, Major U. S. Topographical Engineers. Doc. 
No. 121. Jan. 1838. 8vo. pp. 101.—This valuable document is chiefly 
occupied with tables showing the flow of the tides at Provincetown 
Harbor, and at Race Point, Cape Cod, Mass., in 1833, 1834, and 1835, 
and with quarter-hourly tide tables kept at Provincetown Harbor, in 
June and July, 1835. The observations were made and the tables pre- 
pared under the direction of Major Graham. They have evidently cost 
much persevering labor, and are very creditable to all concerned. Ob- 
servations on the phenomena of the tides are at the present day re- 
ceiving much attention from men of science in various parts of the 
world, and we have no doubt this contribution will be gladly welcomed 
by all those engaged in the elucidation of this interesting subject. 
11. Prodromus of a Practical Treatise on the Mathematical Arts: 
containing directions for Surveying and Engineering ; by Amos 
Eaton, A. B. and A. M., Senior Professor in Rensselaer Institute. 
8vo. pp. 191. Troy, N. ¥Y. 1838.—The author in his preface states, 
that this volume is made up of selections from a mass of heterogeneous 
materials which he has been depositing in his common journal for 
more thanthirty years. Itisa large collectiun of miscellaneous hints, 
principles, rules and processes in practical science. The following 
list of the titles will furnish a partial idea of the topics treated of :— 
Arithmetic, Trigonometry, Mensuration, Land-Surveying, Statics and 
Dynamics, Mechanical Powers, Architecture, Rail Roads, Excavations 
and Embankments, Canals, Roads in general, Water works, water 
power applied to milling, &e., Topography, Materials for construc- 
tion, Useful Rocks and Cements, Timber materials, Iron materials. 
It is not easy to give an abstract of a work of this nature. A brief 
inspection has satisfied us that it contains much valuable matter, and 
that it cannot fail to be of great service to all engaged in the busi- 
ness of engineering. 
12. Hydrogen gas in a lead pipe, used as an aqueduct, in a letter 
to the Editor from Netson Watxty.—I was at the house of a friend 
during the Jast summer, and while there, he was engaged in laying 
lead pipe from a spring to his house for conducting the water, a dis- 
tance of three quarters of a mile. 
Between the spring and his house was a hill several feet higher 
than the spring, and several whose summits were not as high. His 
house was fifteen feet lower than the spring. He informed me that he 
had laid down his pipe several times and set the water running, but 
50 
Vou. XXXIV.—No. 2 
