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SCIENCE 



A WEEKLY RECORD OF SCIENTIFIC PROGRESS. 



ILLUSTRATED. 



Entered in the Office of the Librarian of Congress, at Washington, D. C. 



Vol. I—No. 9. 



August 28, 1880. 



Price 10 Cents. 



FROST & ADAMS, 



Importers and Dealers in 



ARTISTS' MATERIALS, 



Architects' and Engineers' Stationery, 



MATHEMATICAL INSTRUMENTS, Etc., 



33 & 35 CORNHILL, 



t^" Catalogues furnished gratis. BOSTON. 



JOSEPH ZENTMAYER, 



MANUFACTURER of 



MICROSCOPES AND MICROSCOPIC APPARATUS, 



147 South Fourth Street, Philadelphia. 



^r MICROSCOPES from: $50 to $i,ooo. 



Catalogues on Application. 



R. & J. BECK, 



Manufacturing Opticians, 



1016 Chestnut Street, Philadelphia, 



Offer the largest, best assorted and cheapest stock of 



Microscopes and Accessories, 



Mounting Implements and Materials, Prepared Objects, 



Thermometers, Barometers, Compasses, 



Spectacles, Opera-Glasses and Telescopes 



To be found in this country. 



J3§f Condensed and Illustrated Circular sent to any address by mail, 

 free. Full Illustrated Catalogue of 150 pages for three stamps. 



MAGIC LANTERNS 



AND 



STEREOPTICONS 



of all kinds and prices. Views illustrating every subject, for Public 

 Exhibitions and Class Demonstrations. 



Also LANTERNS for Colleges and Day Schools, Sunday Schools 

 and Home Amusement. A full assortment of UPRIGHT LANTERNS, 

 OXY-HYDROGEN LIGHTS MICROSCOPIC ATTACHMENTS. 

 &c, and a good line of Scientific Illustrations, constantly on hand and 

 made to order. 



E^" 74-Page Illustrated Catalogue sent for Stamp. 



Note. — Teachers, Clergymen and Professional men have found pleasant 

 and profitable occupation in giving public entertainments with a Magic 

 Lantern and a good assortment of interesting Views. 



Send for Catalogue to 



McALLISTER, Manufacturing Optician. 

 49 Nassau St., N. Y. 



L. PRANG & CTO., 



ART AND EDUCATIONAL PUBLISHERS, 



286 Roxbury Street, Boston, Mass. 



Publishers of the system of Industrial Drawing prepared for public 

 schools by Prof.Walter Smith, General Supervisor of Drawing in the Bos- 

 ton public schools, and State Director of Art- Education in Mass. 



The American Drawing Models for the use of common schools, 

 drawing classes and schools of art and science. 



Drawing Materials. Prang's American Chromos. 



Prang's Natural History Series, for schools and families. Animals 

 and plants represented in their natural colors, and arranged for instruc- 

 tion with object-lessons. 



PHOTOGRAPHIC SPECIALTY 



We make Photographic Negatives (8 x 10 inches) of Plans, Drawings, 

 Models, etc., for 



ONE DOLLAR EACH. 



Copies 50 cents each. 



Special Skylight for Mechanical Photography and Copying 



ROCKWOOD, No. 1 7 Union Square, West. 

 GRANT'S 



Revolving and self-closing filteR 



This new Filter overcomes all objections to filters, and is perfect in con- 

 struction »nd operation. It is cleansed by the handle on the outside tnor- 

 oughly and instantly. It breaks the force of the water and thereby secur- 

 ing perfect filtration. It supplies a full force of water, without filtration, 

 when wanted. It is the best filter ever invented. Price $2 and $5. 



For sale by the leading dealers in Plumbers' Materials. 



A. C. KEENEY & CLARKE. 



Wholesale Agents, 



No. 54 Cliff Street, New York. 



WHITALL'S Miniature PLANISPHERE. 



A Map of the Heavens, at every minute, showing 42 prominent 

 constellations and 440 chief stars. Should be in the hands of every 

 teacher and sludent in Astronomy, and can be used with pleasure and 

 profit by every one. 



Size 5} x 5-V inches. Price, 30 Cents. 



Sent by mail, prepaid, on receipt of price. Liberal discounts al- 

 lowed for introduction and to the trade. Address 



McCLEES & GRIFFETH, Gen'l School Furnishers, 



1026 Arch street, Philadelphia. 



Established 1845. 



W. & L. E. GURLEY, Troy, N. *., 



manufacturers of 



CIYIL ENGINEERS' and SURVEYORS' INSTRUMENTS, 



dealers in all kinds of 



DRAWING INSTRUMENTS, PAPE1* VELLUM 



and supplies for Civil Engineers and Surveyors, for both field and office 

 use. J3^~Full illustrated price-list on application. 



CATALOGUES ON APPLICATION. 



PART I. — Mathematical Instruments (160 pp). 



" II. — Optical Instruments and Microscopes (144 pp). 



" III. — Magic Lanterns and Slides (112 pp). 



" IV. — Philosophical and Chemical Apparatus '193 pp) 



JAMES XV. QUEEN & CO., 



924 Chestnut Street, Philadelphia. 



This NEW STYLOGRAPHIC PEN is now brought to the 

 notice of the public with perfect confidence of its great superiority over 

 anything of its class hitherto produced, and those who have contemplated 

 purchasing can now feel assured of getting the very best and latest thing 

 out. Please send stamp for circular. 



THE STYLOGRAPHIC PEN CO., 



169 Broadway, New York, Room 13. 



