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means to be adopted will depend greatly upon the conditions of each individual case. Moreover, this belongs to another branch of sanitary science, and I am wandering away from ventilation.

What has been said with respect to ventilating drains connected with sewers will apply with more force where there are cesspools. For in the former case there may be no evolution of foul and dangerous gases even for years, while in the latter it is certain and continuous.

It is of no use to try and enclose it in the cesspool, free vent must be given if you would keep death and disease out of your houses.

In concluding these somewhat disjointed observations on a very important subject, I. would ask the reader to remember that the whole paper has been written at different times, when a few moments could be spared from more pressing matters, and if I have not adhered strictly to ventilation, pure and simple; yet drainage and warming are so intimately connected with it, that it is difficult to treat of one without drawing in the others also.

Very much more might have been said about ventilating public buildings, such as churches for instance, where no attempt seems ever made to get fresh air in, or foul gas out of the building, but I have simply endeavored to convey a little useful information to the reader, which will, I hope, be of service in improving domestic comfort, and keeping disease away from our homes.

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SCIENTIFIC BOOKS,

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FRANCIS. Lowell Hydraulic Experiments, being a selection from Experiments on Hydraulic Motors, on the Flow of Water over Weirs, in Open Canals of Uniform Rectangular Section, and through submerged Orifices and diverging Tubes. Made at Lowell, Massachusetts. By James B. Francis, C. E. 2d edition, revised and enlarged, with many new experiments, and illustrated with twenty-three copperplate engravings. I vol. 4to, cloth..

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CLARKE (T. C.) Description of the Iron Railway
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TUNNER (P.) A Treatise on Roll-Turning for the
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sylvania Steel Works, with numerous engravings wood cuts and folio atlas of plates.. ISHERWOOD (B. F.) Engineering Precedents for Steam Machinery. Arranged in the most practical and useful manner for Engineers. By B. F. Isherwood, Civil Engineer, U. S. Navy. With Illustrations. Two volumes in one. 8vo, cloth.... BAUERMAN. Treatise on the Metallurgy of Iron, containing outlines of the History of Iron Manufacture, methods of Assay, and analysis of Iron Ores, processes of manufacture of Iron and Steel, etc., etc. By H. Bauerman. First American edition. Revised and enlarged, with an Appendix on the Martin Process for making Steel, from the report of Abram S. Hewitt. Illustrated with numerous wood engravings. 12mo, cloth...

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CAMPIN on the Construction of Iron Roofs.
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COLLINS. The Private Book of Useful Alloys and
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COLBURN. The Gas Works of London. By Zerah
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CRAIG (B. F.) Weights and Measures.

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GLYNN (J.) Treatise on the Power of Water, as applied to drive Flour Mills, and to give motion to Turbines and other Hydrostatic Engines. By Joseph

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