SCIENCE. 



in 



Electrical Batteries for Medical Purposes. 



^E^TEI^N |^LECTF(IC <? JVIaNUF j ACTUF{IJn|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, POCKET 

 BATTERIES, BATH APPARATUS, AND 

 ELECTRODES. 



Dr. Butler's Plumbago Rheostat, 



PLIABLE SPONGE ELECTRODES, &c. &c 



EDISON'S 



ic Pen & Duplicating Press, 



ftn pxtremely JJseful Jnvention 



Electric 



DUPLICATING WRITTEN OR PRINTED MATTER. 



CATALOGUES ON APPLICATION. 



Address all Orders to 



Western Electric ManT g Co. 



38 Union Square, 

 — NEW YORK 

 CITY. 



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



.is successfully used by Schools, Colleges, Banks, Commission Houses, Mercantile Firms, Lawyers, 

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



10,000 fens now in jJse and tfye pemand £teadily Increasing ! 

 No. 1, $25.00; No. 2, $30.00; No. 3, $35.00 



Full Description and Samples of Work sent cn Application. 



EDISON'S ELECTRIC PEN AND PRESS, 



38 Union Square, New York City. 



James W. Queen & Co., 

 OPTICIANS, 



924 Chestnut St., Philadelphia. Pa. 



Magnifying Glasses, Microscopes , 

 Mounting Materials, Insect Pins, 

 etc., etc. 



J Catalogues sent on Application. 



Part 1st, Mathematical Instruments. 



" 2d Optical Instruments. 



" 3d Magic Lanterns and Slides. 



" 4th Physical Instrument. 



From our own experience we can confidently recommend to all 

 Nervous and Debilitated persons 



dr. ceosby's brain and neeve food, 



The Vitalized Phosphites, 



BECAUSE 



It is largely prescribed by Physicians. 



It is much taken by Cl-rgymen, 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 

 nukes a less fretful and happier childhood. 



Every Wholesile Druggist in the U. S. buys it in large quantifies. 



SCIENCE 



A. "WEEKLY JOURNAL OF SCIENTIFIC PROGRESS 



Vol. II. No. 45, ------- May 7, 1881. 



CONTENTS. 



Dr. Detmers on the Swine-Plague (Edit); Mountain Elevation, and Changes of Temperature, in Geology, by Samuel J. 

 Wallace ; Remarks on a Pathogenic Schizophyte, by Prof. H. J. Detmers ; The Kansas City Time Ball, by Prof. H . 

 S. Pritchett; The Unity of Nature, VII.-, {continued), by the Duke of Argyll ; Books Received; Notes, Astronomi- 

 cal, Chemical, &c, &c, &c. 



Subscription, Four Doliars a Year. Single Numbers, Ten Cents. 



