SCIENCE. 



iii 



Electrical Batteries for Medical Purposes. 



J HE ^E^TEFfN ^LECTF(IC ^ANUFACTUF(IJs(q £o. 



CHICAGO, 



NEW YORK, 



Manufacturers of and Dealers in 



STATIONARY GALVANIC BATTERIES, PORTABLE HIGH 

 ELECTROMOTIVE FORCE BATTERIES, CHLORIDE 

 OF SILVER BATTERIES, GALVANO-CAUTERY 

 BATTERIES, FARADAIC BATTERIES, POCK 

 BATTERIES, BATH APPARATUS, AN 

 ELECTRODES. 



EDISON'S 



Electric Pen & Duplicating Press, 



fin pxtremely JJseful Jnvention 



Dr. Butler's Plumbago Rheostat, 



PLIABLE SPONGE ELECTRODES, &c, &c. 



DUPLICATING WRITTEN OR PRINTED MATTER. 



CATALOGUES ON APPLICATION. 



8,000 Copies from a Single Writing, at the Rate of 400 an Hour. 



Address all Orders to 



Western Electric ManTg Co 



38 Union Square, 

 — NEW YORK — 

 CITY. ^ 



ll is successfully used by Schools, Colleges, banks, Commission Houses, Mercantile Firms, Lawyers, 

 linisters, Copyists, and every person or firm desiring a number of duplicates of any document. 



10,000 fens now in jJse and tfye Pemand jSteadily Increasing 

 No. 1, $25.00 ; 



ull Description and Samples of Work sent on Application. 



No. 2, $30.00 ; 



No. 3, $35.00 



EDISON'S ELECTRIC PEN AND PRESS, 



38 Union Square. New York City. 



JAMES W. QUEEN & CO. 

 OPTICIANS, 



924 Chestnut St., Philadelphia, Pa. 



The New $50 Microscope 



{See Illustration.') 

 Write for Catalogue of Magnifying 

 Glasses, Microscopes, Microscopic 

 Objects, Microscopic Books, Mi- 

 croscopic Object Glasses, Micros- 

 copic Accessories, Mounting Ma- 

 terials, &c, and mention t/iis 

 yournal. 



Catalogues in 4 parts as follows: 

 Part 1st, Mathematical Instruments. 

 " 2d Optical Instruments. 

 " 3d Magic Lanterns and Slides. 

 11 4th Physical Instruments. 



From our own experience we can confidently recommend to all 

 Nervous and Debilitated persons 



dr. crosby's brain and nerve food, 



The Vitalized Phosphites, 



BECAUSE 



It is largely prescribed by Physicians. 



It is much taken by Clergymen, School Teachers, Lawyers, 

 Students, and all who over-use the brain. 



It cures Nervous Disorders, especially where it exists with Debility 



By curing Debility, it prevents Consumption. 



Many who have been great sufferers with Nervousness, Sleep- 

 lessness and Neuralgia, speak of it in the highest praise. 



It gives vigor to the mental and bodily growth of children, and 

 makes a less fretful and happier childhood. 



Every Wholesale Druggist in the U. S. buys it in large quantities. 



SCIENCE 



A. WEEKLY JOURNAL OF SCIENTIFIC PROGRESS 



Vol. II. No. 46, ------- May 1 4, 1 88 1 . 



CONTENTS. 



The " Zero Motor," (Edit.) ; Discovery of Fossil Forms in Meteorites, (Edit.) ; The Venom of Human Saliva ; Scientific 

 Societies of Washington ; The Ultra-Gaseous or Radiant State of Matter, by Prof. H. S. Carhart ; The Great Astron- 

 omical Telescope for the Vienna Observatory ; Professor Draper's Photographs of the Nebula in Orion ; The Polari- 

 zation of Sound, by Prof. S. W. Robinson ; On a Method of Isolating the Mammalian Heart, by H. Newton Martin ; 

 Edinburgh Royal Society ; Notes, Astronomical, Chemical, Physical, &c, &c, &c. 



Subscription, Four Dollars a Year. 



Single Numbers, Ten Cents. 



