SCIENCE. 



m 



JEWETT'S 



Portable Crock Filter. 



Bit. Nov. 16, 1S69, Ocl. 15, 1878. 



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 F ilter re-packed) that 

 they should purchase a new filter crock, 

 the cost of which is moderate, and no 

 more than the cost of repacking. 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 1 00,000 now in use. 



Acknowledged the only complete Filter 

 ind Cooler in the world. 



JEWETT'S 



PORTABLE CROCK 



FILTER 



WITH PORCELAIN-LINED 



COOLER. 



This is the only Filter hnving 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. 



STAINED OAK. 



No. 6i, Porcelain Reservoir, 4^ quarts $6-7S each. 



" 62. " ' 7% " 8 -7S " 



" 63, '* " 11 " 10.50 



" 64, " " 16 " 12-5° 



" 65, " " 26 " 15-0° " 



OKNAMKXTAI, STYI.E. 



No. 71, Porcelain Reservoir, 4^ quarts . $7-25 each. 



? 2 < \\ 



73, * fc 11 11 11.00 



" 74. " " 16 " 13-00 " 



' 7Si " " 26 " 15.50 " 



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«r years. Our sales 

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



BOARD OF HEALTH, Washington^ D. C.,A»g. 37, 1877. 

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

 fral 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 apply equally 

 *o 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., sa6 Broadway. J. H. BALDWIN & CO., 21 Murray Street. L. HEYNIGER, 



18 Fulton Street. CHARLES JONES, 920 Broadway. LEWIS & CONGER, 601 Sixth Aveni'e. 



SCIENCE: 



A. WEEKLY JOtiBNAL OF SCIENTIFIC PROGRESS. 



Vol. II. No. 37, ------- March 12, 1881. 



CONTENTS. 



Insanity versus Civilization (Edit.) ; Scientific Societies in Washington, D, C; Action of an Intermittent Beam of Radiant 

 Heat upon Gaseous Matter, John Tyndall ; The Unity of Nature : On the Moral Character of Man, Considered in 

 the Light of the Unity of Nature, VI. (Continued), The Duke of Argyll ; The Lick Observatory, W. C. W. ; Books 

 Received ; Correspondence ; Notes. 



Subscription. Four Dollars a Year. 



Single Numbers, Ten Cents. 



