SCIENCE. 



111 



JEWETT'S 



Portable Crock Filter, 



Piil. Nov. 16, 1SH9, Oct. 15, 1678. 



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, thertfore, recom- 

 mend parties at a distance (instead cf 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. 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 1 00,000 now in use. 



Acknowledged the only complete Filter 

 \f" rnd Cooler in the world. 



J E W E TT ' S 



POPTABLE CROCK 



FILTER 



WITH FORCE LA IN- LINED 



COOLER. 



This is the only Filter hiving the Pat- 

 ent Removable Filtering Cup attached, 

 which holds all sediment that would oth- 

 erwise pass into the filter. 



Th s celebrated F.ltf r will take river, 

 lake, pond, rain or other impure water, 

 and render the same of 



Sparkling Transparency 



and Purity. 



HTAIM H OAK. 



6i, Porcelain Reservoir 

 62. 



63, " 



64, " 



65, " 



4}^ quarts- 

 1% " - 

 11 



16 " - 

 26 " - 



$6.75 each. 

 8.75 



IO.5O 

 I2.5P 

 I5.00 k ' 



ORNAMENTAL STYLE. 



*Vo. 71, Porcelain Reservoir, 4% quarts - $7.25 each. No. 



? 2 - 1; *«s 



73, 11 11.00 



" 74, " " 16 " - 13-°° ■ 



* 75i " " 26 " »5-5° " 



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've years. Our sales 

 oi 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.,Aug. a 7 , 1877. 



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

 tral months ago tor 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 anv mechanical arrangement known to me. The foregoing remarks AI'PLY equally 



"O THE LARGR 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. 



«OR Sale in New York City by KING, BRIGGS & CO., so6 Broadway. J. H. BALDWIN & CO., 21 Murray Street. L. HEYNIGER, 



18 Fulton Street. CHARLES JONES, 920 Broadway. LEWIS & CONGER, 601 Sixth Avenwe. 



SCIENCE: 



A. WEEKLY JOURNAL OB 1 SCIENTIFIC PROGRESS. 



Vol. II. No. 36, ------- March 4, i 88 1 . 



CONTENTS. 



Microscopes and their Objectives (Edit); Walker Prizes in Natural History ; The Odontornithes: Extinct Toothed Birds 

 of North America, by Prof. O. C. Marsh ; The Unity of Nature, VI., by the Duke of Argyll ; Atmospheric Ozone for 

 January, 1881, by L. P. Gratacap ; Note on the Posterior Brain of the Stegosaurus, by Prof. Burt G. Wilder : 

 Atmospheric Dust, by Dr. T. L. Phipson ; The Cordoba Observatory, by W. C. W. ; The Davidson Astronomical 

 Observatory at San Francisco, California ; Science in France, by Cosmos ; Announcements ; Notes, Astronomical, 

 Botanical, etc., etc., etc. 



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