SCIENCE. 



iii 



Electrical Batteries for Medical Purposes. 



^ HJE ^E^TEFfN J^LECTF[IC ^ANUFACTUF(I^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, 



fin fxtremely Useful Jnyention 



Electric 



DUPLICATING WRITTEN OR PRINTED MATTER. 



CATALOGUES ON APPLICATION. 



Address all Orders to 



Western Electric Man'f g Co. 



• ' '■ 38 Union Square, 

 - NEW YORK 

 CITY. 



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



; successfully used by Schools, Colleges, Hanks, 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 £teadily jncreasing ! 

 No. 1, $25.00; No. 2, $30.00; No. 3, $35,00, 



Full Description and Samples of Work sent on Application. 



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 this 

 Journal. 



Catalogues in 4 parts as follows : 

 Part 1st, Mathematical Instruments. 

 " 2d Optical Instruments. 

 " 3d Magic Lanterns and Slides. 

 " 4th Physical Instruments. 



SCIENCE 



A WEEKLY JOURNAL OF SCIENTFIC PROGRESS. 



Vol. II, No. 55, 



CONTENTS. 



July 16, 1881 



Drawings of Comet, by Professor Ed. S. Holden (Edit.); The Lady Franklin Bay 

 Expedition (Edit.); Photometric Observations of Comet, by Professor Ed. C. Pick- 

 ering ; The Unity of Nature, by the Duke of Argyll; The Comet, (with four illus- 

 trations); The Tail of Comets, by M. Th. Bredichin ; On the Overgrown Teeth 

 of Fiber Wibethicus, by Herman L. Fairchild, (2 illustrations); Fire Balls, by 

 Dr. R. H. Ward ; Letter from Dr. J. J. Mason ; Books Received ; Anthropology, by 

 Edward B. Tylor ; Meteorological Report for New York City for the week, by Dr. 

 D. Draper ; War Department Reports for the Month of May, full page of Statistics. 

 Notes: On the Absorbing Power of the AtmosDhere ; Decomposition of 

 Water; Simple Method of Determining Hardness of Water ; Chemistry of the 

 Platinum Metals; Glycerin ; An Industrial and Technological Museum. 



The following from Webster, page 1104, shows 

 the value of the Illustrative Definitions in 



Webster's Unabridged Dictionary 



Subscription, Four Dollars a Year. 



Single Numbers, Ten Cents. 



1, flyingjib; 2, jib; 3, fore-top-mast-stay sail; 

 4, fore-course; 5, foretop sai I ; 6, foretop-gallant 

 sail; 7, fore-royal; 8, fore sky-sail; 9, fore-roy- 

 al studding sail; 10, foretop-gallant studding- 

 sail; 11, foretop-mast studding-sail; 13, main- 

 course; 13, maintopsail; 14, maintop-gallant 

 sail; 15, main-royal; 16, main sky-sail; 17, 

 main royal studding-sail; 18, main top-gallant 

 studding-sail; 19, maintop-mast studding sail; 

 20, mizzen-course ; 21, mizzen-top sail; 22, 

 mizzen-top-gallant sail; 23, mizzen-royal; 24, 

 mizzen sky-sail ; 25, mizzen-spanker. 



The pictures in Webster under the 12 words, 

 Beef, Boiler, Castle, Column, Eye, Horse, 

 Moldings, Phrenology, Ravelin, Ships, 

 (pages 1164 and 1219) Steam engine, Tim- 

 bers, define 343 words and terms far better 

 than they could be defined in words. 



New Edition of WEBSTER, has 

 118,000 Words, 3000 Engravings, 

 4600 New Words and Meanings, 



Biographical Dictionary 



of over 9700 Names. 



Published by G. & C. MERRIAM, Springfield, Ma* 



