SCIENCE. 



in 



JEWETT'S 



Portable Crock Filter, 



Pat. Nov. 16, 1S69, Oct. 15, 1M8. 



Patent Pending. 



The Latest Improvement 



consists in placing the filtering material 

 in a separate vessel or crock. The ad- 

 vantage being this, viz ; 



That whenever the filter part gives 

 out, a new crock can be obtained, which 

 will make the whole complete as when 

 first purchased. We, therefore, recom- 

 mend parties at a distance (instead of at- 

 tempting to get the Filter re-packed) that 

 they should purchase a new filter crock, 

 the cost of which is moderate, and no 

 more than the cost of repacking. 



ORNAMENTAI, STYI.E. 



No. 71, Porcelain Reservoir, 4^ quarts $7.25 each. 



"533 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 100,000 now in use. 



Acknowledged the only complete Filter 

 xnd Cooler in the world. 



JEWETT'S 



PORTABLE CROCK 



F ILT E R 



WITH PORCELAIN-LINED 



COOLER. 



This is the only Filter h»ving the Pat- 

 ent Removable Filtering Cup attached, 

 which holds all sediment that would oth- 

 erwise pass into the filter. 



This celebrated Filter will take river, 

 lake, pond, rain or other impure water, 

 and render the same of 



Sparkling Transparency 



and Purity. 



7 l A 



9-25 



11.00 

 13.00 

 15-50 



STAINED OAK. 



56.75 each. 



8.75 :: 



10.50 

 J2.50 

 15.00 



No. 61, Porcelain Reservoir, i\% quarts 



" 62. " > 7 'A " - 



' 63, n " 



" 64, " 16 ' -- 



" 65, " " 26 " 



READ THE TWO MOST CONVINCING TESTIMONIALS. 



Isaac S. Williams & Co., 728 Market Street, Philadelphia, Pa.— We have sold your "Patent Water Filter" for the last s« years. Our sales 

 in that time having reached upwards of five thousand, and in no instance have we heard of any failure in performing all you claim for them. 



BOARD OF HEALTH, Washington, D. C.,Aug. » 7 , 1877. 



Webb & Peveridge: — I am just in receipt of your favor of yesterday, requesting my opinion of the 'Jewett Filter" purchased of you sev- 

 eral months ago for my personal use, and am pleased to say that it has fully answered your expressed estimate of its value. As a cleanser and 

 purifier of drinking water it is certainlv not excelled by any mechanical arrangement known to me. The foregoing remarks ArpLY equally 



TO THE LARGE FILTER OF THE SAME MAKE PURCHASED FOR THE BoARD OF HEALTH. 



Very respectfully yours, CHRIS. C. COX, M. D. 



Manufactured only by JOHN C. JEWETT & SONS, Buffalo, New York. 



For Sale in New York City by KING. BRIGGS & CO., 596 Broadway. J. H. BALDWIN & CO., 21 Murray Street. L. HEYNIGER, 



18 Fulto 1 Street. CHARLES JONES, 020 Broadway. LEWIS & CONGER, 601 Sixth Avenne. 



SCIENCE: 



Vol. 1, No. 1 July 3, 



CONTENTS. 



I88O. 



Original Papers. — The United States Observatory, by Professor Edward S. Holden. A Bit of Summer Work, by Professsor Burt 

 G. Wilder, M. D. Electricity as Power, by Francis P. Upton, Esq., Menlo Park. Diatomaceae v. Desmidiaceae, by Professor 

 H. L. Smith. Salutatory, by The Editor. Articles by Dr. John C. Morgan, on Errors of Retraction in the Eyes of Microscopists. 

 Mr. Redout on Improved Thermo-Electric Apparatus, Professor Huxley on the Practical Value of Science, Mayer Davis on 

 Electrical Insects. Notes on Electricity, Astronomy, Microscopy, Natural History, and various science notes of value and interest. 



Vol. 1, No. 2^ \ \ \ \ \ \ July IO, I88O. 

 CONTENTS : 



Original Papers, by Professor Ormond Stone, of the Cincinnati Observatory, on Uniform Time, Dr. H. C. H. Herold on the 

 Water Supply of Cities ; Edison Electric Light, by the Editor. Articles by Professor Huxley, on the Coming of Age of the 

 Origin of Species, Review of Water Analysis, Professor C. William Siemens on Improvement in Dynamo-Electric Currents. 

 Notes on Microscopy and Natural History.. Observations on Slivering Glass, and other minor articles of interest. 



Vol. 1, No. 3^ '. '. '. '. '. '. July 17, 1880. 



CONTENTS. 

 Original Papers, by Dr. Spitzka, on Anthropology, Professor H. L. Smith, of Hobart College, on Dry Mounts in Microscopy; 

 Co-operation in Science, by the Editor, and other interesting articles. Study in Darwinism by Alfred A. Wallace, Esq., Fourth 

 State of Matter, by Professor W. Crookes, and reply to same, by the Duke of Argyle, Degeneration, by Alfred A. Wallace, Esq. 

 Editorial Notices, Correspondence, and current scientific items of interest. 



Vol. 1, No.4^ '. '. '. '. . . July 24, I88O. 

 CONTENTS : 

 Original Papers, by William T. Hornaday, on American Taxidermy; Professor Horace F. Jayne, on Monstrosities in American 

 Coleoptera (with full page of illustrations) ; American Association for the Advancement of Science, by the Editor ; Lt. Colonel 

 W. A. Ross' Letter to the Royal Society. Articles by Professor G. J. Allman, on the Newly Discovered Fresh Water Medusa ; 

 by Lt. Colonel Ross, on D-Lines Spectra; Description of M. Tchickoleff's Electric Lamp (Illustrated); An Important Discovery 

 (Manufacture of Ammonia) ; and Minor Scientific Notes of Interest. 



OFFICES : 329 BROADWAY, IOCW YORK, 



