Periodicals Books

A Chemist of merit, Mr. A. Müntz, who has already made himself known by important labors and by analytical researches of great precision, has been led to a very curious and totally unexpected discovery, on the subject of which he has kindly given us information in detail, which we place before our readers.[1] Mr. Müntz has discovered that arable soil, waters of the ocean and streams, and the... more...

Since the publication of our article on the Brazilian Treaty, we have received several letters from individuals who, agreeing with us entirely in the free-trade view of the question, nevertheless are at variance with us as to the commercial policy which we should pursue towards that country, in order to coerce them into our views regarding slavery. We are glad to feel called upon to express our views... more...

Nitro-Glycerin. Professor Doremus of this city was called as a witness at the inquest upon the bodies of the unfortunate persons killed by the recent explosion at Bergen, N.J. The Professor having previously analyzed some of the explosive mixture, testified as follows:—"I have subjected it to chemical analysis, and find it to correspond to the formula C_{6}, H_{3}, O_{3}, and NO_{5}; it is well... more...

IMPROVED FILTER PRESSES. Hitherto it has been found that of all the appliances and methods for separating the liquid from the solid matters, whether it is in the case of effluents from tanneries and other manufactories, or the ocherous and muddy sludges taken from the settling tanks in mines, some of which contain from 90 to 95 per cent. of water, the filter press is the best and the most economical,... more...

CONSTITUTION Article I Name. This Society shall be known as the Northern Nut Growers Association, Incorporated. Article II Object. Its object shall be the promotion of interest in nut-bearing plants, their products and their culture. Article III Membership. Membership in this society shall be open to all persons who desire to further nut culture, without reference to place of residence or nationality,... more...

ELECTRICAL LABORATORY FOR BEGINNERS. By GEO. M. HOPKINS. It is only when theory and practice, study and experiment, go hand in hand that any true progress is made in the sciences. A head full of theory is of little value without practice, and although the student may apply himself with all his energies for years, his time will, to a great extent, have been spent in vain, unless he by experiment rivets... more...

COACHY. BY ELINOR VEY. The first time I ever saw Coachy she was scratching about on the garden walk, kicking the dirt out in two ways behind her, and then nimbly hitching back a step or two and staring and pecking at the hole that she had made. Every little while she said something to herself in a comical drawling tone, standing on one foot, and looking up at me with curious eye, as if wondering who I... more...

The inauguration of the statue of Philip Lebon, the inventor of lighting by gas, occurred on the 26th of June, at Chaumont, under the auspices of the Technical Gas Society of France. The statue, which we illustrate herewith, is due to the practiced chisel of the young sculptor Antide Pechine, who has perfectly understood his work, and has represented the inventor at the moment at which he observes a... more...

THE FRENCH SCIENTIFIC STATION AT CAPE HORN. In 1875 Lieutenant Weyprecht of the Austrian navy called the attention of scientific men to the desirability of having an organized and continual system of hourly meteorological and magnetic observations around the poles. In 1879 the first conference of what was termed the International Polar Congress was held at Hamburg. Delegates from eight nations were... more...

FARCOT'S IMPROVED WOOLF COMPOUND ENGINE. In a preceding article, we have described a ventilator which is in use at the Decazeville coal mines, and which is capable of furnishing, per second, 20 cubic meters of air whose pressure must be able to vary between 30 and 80 millimeters. In order to actuate such an apparatus, it was necessary to have a motor that was possessed of great elasticity, and... more...