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Rh rope. The greater part of the apparatus used was either new or improved forms of that ordinarily used, and much of it was due to the ingenuity of Commander Sigsbee. The present work does not go into the results obtained by the various expeditions, but is devoted to a description of the apparatus employed and statement of its actual value in use. Detailed drawings supplement the descriptions, and a large number of heliotype plates clearly show the arrangement and method of using on board ship.

Circulars of Information of the Bureau of Education. No. 3. Legal Rights of Children. Washington: Government Printing-Office. 1880. Pp. 96.

Address before the American Association for the Advancement of Science, Section A. By Asaph Hall. Boston Meeting, August 25, 1880. Cambridge: John Wilson & Son. Pp. 16.

Progress of Western Education in China and Siam.??. 13. The Indian School at Carlisle Barracks. Pp. 5. Vacation Colonies for Sickly School Children. Pp. 3. From the Bureau of Education. Washington: Government Printing-Office. 1880.

Water Pollution, and a Remedy for the Evils of the Present Water-Supply Systems proposed. By Nelson Green. New York: The Hub Publishing Co. Pp. 29.

Who planned the Tennessee Campaign of 1862? or, Anna Ella Carroll vs. Ulysses S. Grant. By Matilda Joslyn Gage. Pp. 16.

An Examination of the Double-Star Measures of the Bedford Catalogue. By S. W. Burnham, Esq. Pp. 36.

What constitutes a Discovery in Science? By Dr. George M. Beard. New York. 1880. Pp. 7.

A Reply to Criticisms on "The Problems of Insanity." By Dr. George M. Beard. 1880. Pp. 34.

Occurrence of Microscopic Crystals in the Vertebrae of the Toad. By H. Carrington Bolton. Pp. 4.

Notice of Jurassic Mammals representing Two New Orders. By Professor O. C. Marsh. Illustrated. Pp. 5.

National Association for the Protection of the Insane and the Prevention of Insanity. Boston. 1880. Pp. 31.

Bulletin of the Philosophical Society of Washington. Vol. I. 1871-'74. Pp. 49. Vol. II. 1874-'78. Pp. 392. Vol. III. 1878-'80. Pp. 169. Washington: Published by the Cooperation of the Smithsonian Institution.

Drug Attenuation: its Objects, Modes, Means, and Limits in Homœopathic Pharmacy and Posology. By the Bureau of Materia Medica, Pharmacy, and Provings in the American Institute of Homœopathy, 1879 and 1880, J. P. Dake, M. D., Chairman. Philadelphia: Sherman & Co. 1880.

Action of Light on the Soluble Iodides, with the Outlines of a New Method in Actinometry. Pp. 22. The Literature of Ozone and Peroxide of Hydrogen. Pp. 63. Laws governing the Decomposition of Equivalent Solutions of Iodides under the Influence of Actinism. Pp. 7. By Dr. Albert R. Leeds.

Memoirs of the Science Department of the University of Tokio, Japan. Vol. III, Part I. Report on the Meteorology of Tokio for the Year 2539 (1879). T. C. Mendenhall. Tokio: Government Printing-Office. 1880.

On the Algebra of Logic. By C. S. Peirce. Reprinted from the "American Journal of Mathematics." Pp. 42.

The Textile Record of America. Devoted to the Manufacture and Distribution of all Woven Fabrics: Cotton, Wool, Silk, and Flax Culture. Edited by Lorin Blodget. Philadelphia: Nagle & Ryckman. Monthly. Pp. 16. $3 a year.

An Elementary Treatise on Analytic Geometry, embracing Plane Geometry and an Introduction to Geometry of Three Dimensions. By Edward A. Bowser. New York: D. Van Nostrand. 1880. Pp. 287.

American Aristocracy. A Sketch of the Social Life and Character of the Army. By Duane Merritt Greene. Chicago: Central Publishing Co. 1880. Pp. 222. $1.

The Minor Arts. By Charles G. Leland. Illustrated. London: Macmillan & Co. 1880. Pp. 148. 90 cents.

Hints for Home Reading. A Series of Chapters on Books and their Use by Different Authors. Edited, with an Introduction, by Lyman Abbott. New York: G. P. Putnam's Sons. 1880. Pp. 152. 50 cents.

School and Industrial Hygiene. By D. F. Lincoln, M. D. Philadelphia: Presley Blakiston. 1880. Pp. 152. 75 cents.

German Thought from the Seven Years' War to Goethe's Death. By Karl Hillebrand. New York: Henry Holt & Co. 1880. Pp. 298. $1.75.

Diseases of the Throat and Nose. By Morell Mackenzie, M. D., London. Vol. I. Diseases of the Pharynx, Larynx, and Trachea. Illustrated. Philadelphia: Presley Blakiston. 1880. Pp. 570. $4.



Improved Safety Construction of Elevators.—With an appliance in such general use as the elevator, means of securing safety in case of the parting of the cable, or failure of other parts of the moving apparatus, are of prime importance. A great variety of devices, many of them quite ingenious, have been designed to accomplish this object, but few of them are entirely satisfactory. They have done much to decrease accidents, but these still happen frequently enough with them to show the necessity of a more perfect apparatus. These mechanical stops consist of combinations of levers, pawls, and clutches so arranged that the weight of the carriage will throw them into action. Both classes, those which bring the carriage to a sudden stop, and those which act as a break, need to begin to act the moment the fall commences, or the motion becomes so great as to be beyond control. From various causes impossible to provide against, these devices 