Page:Popular Science Monthly Volume 22.djvu/877

Rh "The Journal of Physiology." Michael Foster, Editor, January, 1883. W. T. Sedgwick, Ph.B., Johns Hopkins University, Baltimore. Pp. 42, with Plate. $5 a year.

The Treatment of Acute Eczema. By George II. Rohé, M.D. Baltimore, Md.: Office of Medical Chronicle. Pp. 7.

What shall we do for the Drunkard? By Orpheus Everts, M.D. Cincinnati, Ohio: Robert Clarke & Co. Pp. 51. Price, 50 cents.

Law Reform and the Future of the Legal Profession. By Charles C. Bonney. Chicago: Legal News Company. Pp. 28.

Sixteenth Annual Report, State Board of Charities, New York. Albany: Weed, Parsons & Co. Pp. 28.

Forest Protection and the Tariff on Lumber. Spirit of the Press. No publisher's name. Pp. 35.

Report on the Development of the Resources of Colorado. By Allen Smith, State Geologist, Denver, Colorado: Chain & Hardy. Pp. 159. 35 cents.

Kissena Nurseries, Flushing, New York, Catalogue of Ornamental Trees and Shrubs Parsons & Sons Company, limited. Pp. 88.

Forestry Bulletins, Census Office, Nos. 24 and 25. Amount of Tannin in the Bark of some of the Trees of the United States. Forests of West Virginia.

Archæological Institute of America. Bulletin, January, 1883. Pp. 40; Regulations, Officers, and List of Members. Pp. 14. E. H. Greenleaf, Secretary, Boston, Massachusetts.

Prehistoric Trephining and Cranial Amulets. By Robert Fletcher. United States Army. Washington: Government Printing-Office. Pp. 32, with Plates.

A Study of the Manuscript Troano. By Cyrus Thomas, Ph. D.: Introduction by D. G. Brinton, M.D. Washington: Government Printing-Office. Pp. 237.

The Battle of the Moy: or, How Ireland gained her Independence, 1892-1894. Boston: Lee & Shepard. Pp. 74.

Catalogue of Books published by Houghton, Mifflin & Co., Boston and New York. Pp. 80.

The New-Englanders: A Comedy of the devolution. By E. M. Davidson. New York: Collins & Brother. Pp. 55. For private circulation.

A Handbook of Vertebrate Dissection. By H. Newell Martin. D.Sc., M.D., M.A., and William A. Moale, M.D. Part II. How to Dissect a Bird. New York: Macmillan & Co. 1883. Pp. 85. 60 cents.

The Unending Genesis. By H. M. Simmons. Chicago: The Colegrove Book Company. 1883. Pp. 111.

Astronomy Corrected. By H. B. Philbrook New York: John Polhemus. 1882. Pp. 54.

An Outline of Qualitative Analysis for Beginners. By John T. Stoddard, Ph. D., Northampton, Massachusetts. 1883. Pp. 55. 75 cents.

A Dictionary of Electricity. By Henry Greer, New York, Agent of the College of Electrical Engineering. 122 East Twenty-sixth Street. 1883. Pp. 192. $2.

Electro-Magnets. By T. H. Du Moncel. New York: D. Van Nostrand. 1883. Pp. 112. 50 cents.

A Word, Only a Word. By Georg Ebers. New York: William S. Gottsberger. 1883. Pp. 348.

A New Theory of the Origin of Species. By Benjamin G. Ferris. New York: Fowler & Wells. 1883. Pp. 278. $1.50.

Report upon the Triangulation of the United States Lake Survey. By Lieutenant-Colonel C. D. Comstock. Washington: Government Printing-Office. 1883. Pp. 922, with 30 Plates.

The Theories of Darwin and their Relation to Philosophy, Religion, and Morality. By Rudolf Schmid, with an introduction by the Duke of Argyll. Chicago: Jansen, McClurg & Co. 1883. Pp. 410. $2.

Notes on Evolution and Christianity. By J. T. Yorke. New York: Henry Holt & Co. 1883. $1.50.

Astronomical paper prepared for the Use of the American Ephemeris and Nautical Almanac under the Direction of Simon Newcomb, Ph.D., LL.D. Vol. I. Washington: Bureau of Navigation. 1882. Pp. 487.



Aberrations in Fog-Signals.—Mr. Arnold B. Johnson, of the Light-house Board of the United States, has been pursuing on our coast parallel investigations with those reported some years ago by Professor Tyndall on the aberrations of audibility of fog-signals. The results of this work, as summarized by Lieutenant-Commander F. E. Chadwick, U.S. Navy, who aided in the investigation, are, that navigators, when attempting to pick up a fog-signal, must give attention to the direction of the wind. If they are to the windward of the signal, in a moderate breeze, the chances are very largely against their hearing it, for there is nearly always a sector, of about 120° to windward of the signal, in which it. either can not be heard at all, or is very faintly heard. As they bring the signal to bear at right angles with the wind, the sound will almost certainly in the case of a light wind increase, and will soon assume its normal volume, being heard almost without fail in the leeward semicircle. Fog appears not to be a factor of any consequence whatever in the question of sound. Signals may be heard at great distances through the densest fogs, which may be totally inaudible in the same directions and at the same distances in the clearest atmosphere. It seems established by numerous observations that the best possible circumstances for hearing a fog-signal are in a northeast snow-storm, and they appear to be best heard then with the observer to windward of the signal. In light winds the signal is best heard down the wind or at right angles with the wind. The worst conditions for hearing sound seem to be found in the atmosphere of a clear, frosty morning on which a warm sun has risen and has been shining for two or three hours. The result of the whole is, that "the mariner will do 