NEW YORK, AUGUST 17, 1889.
Reading edition
Scientific American Supplement. Vol. XXVIII., No. 711.
Scientific American established 1845
Scientific American Supplement, $5 a year.
Scientific American and Supplement, $7 a year.
TABLE OF CONTENTS.
PAGE.
I.AGRICULTURE.—How to Raise Turkeys.—A collection of hints and suggestions on the raising of the delicate fowls, so often the cause of trouble to farmers.11364
Pear Duchesse D'Angouleme.—The history of the famous pear tree, with hints as to its culture and general treatment.11362
II.BIOLOGY.—Development of the Embryo.—A note of some interesting biological researches.—By Prof. Preyer, of Berlin.11365
The "Hatchery" of the Sun Fish.—A curious incident in the life history of the common sunfish.—1 illustration.11363
III.CHEMISTRY.—On Allotropic Forms of Silver.—By M. Carey Lea.—A continuation of this paper, containing one of the most important researches in the history of silver, with statement of interesting results attained.11361
On the Occurrence of Paraffine in Crude Petroleum.—A valuable contribution to the history of paraffine, with reference to petroleum and ozokerite.11361
Turpentine and its Products.—By Edward Davies.—A resume of the work done by chemists in the turpentine products.—The different compounds produced therefrom.11361
IV.ELECTRICITY.—Electric Lighting at the Paris Exhibition.—The Oerlikon works.—A very exhaustive exhibition of electric apparatus described and illustrated.—12 illustrations.11356
Magnetism in its Relation to Induced Electromotive Force and Current.—By Elihu Thomson.—A most impressive paper, bringing the obscure laws of magnetic induction within the understanding of all without the application of mathematics.—12 illustrations.11354
The Ader Flourish of Trumpets.—One of the curiosities in telephony from the Paris exhibition, by which sounds are transmitted to a large audience.—4 illustrations.11358
The Electric Motor Tests on the New York Elevated Railroad.—Abstracts of tests which were recently made of the Daft motor on the elevated railroad of this city.11353
V.ETHNOLOGY.—Ancient Lake Dwellings.—Interesting abstract of what is known about lake dwellings, the history of their construction, and the "finds" made on the sites by archæologists.11363
VI.FORESTRY.—Succession of Forest Growths.—A valuable paper on forestry, treating of the evils done by man and a plea for the necessity of intelligent treatment of our woods.11362
VII.HYGIENE AND MEDICINE.—Acetic Acid as a Disinfectant.—Use of acetic acid in septic medical cases as a substitute for carbolic acid and bichloride of mercury.11365
Counter-Irritation in Whooping Cough.—By G.F. Inglott, M.D.—Application of irritants to the skin for curing the paroxysms of whooping cough.11365
On the Health Value to Man of the So-called Divinely Beneficent Gift, Tobacco.—By J.M.W. Kitchen, M.D.—The evils to man and to the soil.—A formidable series of accusations well expressed.11365
Water as a Therapeutical Agent.—By F.C. Robinson, M.D.—An interesting resume of different applications of water in therapeutics.—Suggestions of use for all households.11364
VIII.MILITARY ENGINEERING.—Gibraltar.—A history of this important strategic position and of the different sieges the fortress has undergone.11352
Gibraltar and Neighborhood.—A consular report on the statistics of the famous military station.11352
The Defense of Gibraltar—Experimental Naval and Military Operations.—Interesting series of operations recently carried out under the shadow of the historic rock.—1 illustration.11352
IX.NAVAL ENGINEERING.—Clark's Gyroscopic Torpedoes.—A recent torpedo, in which all the possible parts are made to rotate.—2 illustrations.11353
The First Steamboat on the Seine.—The Marquis de Jouffroy's steamer of 1816.—1 illustration.11353
The Franz Josef I., New War Ship.—Details of the dimensions of the new Austrian ship.—Her armament, speed, armor, etc.11353
X.PHOTOGRAPHY.—Orthochromatic Photography.—By Oscar O. Litzkow.—The last developments in this interesting branch of photographic art, with formulæ.11360
Platinotype Printing.—A description of the most advanced method of conducting the platinum print process.11360
XI.PHYSICS.—Iridescent Crystals.—By Lord Rayleigh.—An abstract of a lecture by the distinguished physicist, detailing some interesting experiments applicable to the colored reflection observed in crystals of chloride of potash.—1 illustration.11366
Transmission of Pressure in Fluids.—By Albert B. Porter.—An apparatus for illustrating the laws of transmission of pressure in fluids, suitable for lecture purposes.—1 illustration.11362
XII.TECHNOLOGY.—Notes on Dyewood Extracts and Similar Preparations.—By Louis Siebold.—The recent development in the preparation of dyewood extracts, with notes of their adulterations.11359
THE DEFENSE OF GIBRALTAR—EXPERIMENTAL NAVAL AND MILITARY OPERATIONS.
