SCIENCE. 



in 



JEWETT'S 



Portable Crock Filter. 



Pat. Nov. 1 6, 1869, Oct. 15, 1878. 



Patent Pending. 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 100,000 now in use. 



Acknowledged the only complete Filter 

 \nd Cooler in the world. 



JEW ETT' S 



The Latest Improvement 



consists in plating 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 disrance (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. 



" 72, " " 7% " 9-25 " 



" 73, " " ir " 11.00 



" 74, " " 16 " 13.00 " 



" 75. " " 26 " - 15-5° " 



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 six 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.,Aitg. 27, 1877. 



Webb & Beveridge: — 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 certainly not excelled by any mechanical arrangement known to me. The foregoing remarks apply 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 Fulton Street. CHARLES JONES, 920 Broadway. LEWIS & CONGER, 601 Sixth Avenne. 



"ORTABLE CROCK 



FILT E R 



WITH PORCELAIN-LINED 



COOLER. 



This is the only Filter having'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, 

 ft and render the same of 



Sparkling Transparency 



and Purity. 



STAINED OAK. 



No. 61, Porcelain Reservoir, 4^ quarts $6.75 each. 



" 62. " ' 7% " 8.75 " 



63, 11 " 10.50 ' 



" 64, " " 16 " 12.50 " 



" 65, " " 26 " 15.00 " 



SCIENCE: 



Vol. 1, No. 1 



July.,3, 1880. 



CONTENTS. 



Original Communications. 

 Salutatory. 



The United States Naval Observatory, Washington By Professor Edward S. Holden, Washington. 



A Bit of Summer Work By Professor Burt G. Wilder, Cornell University, N. Y. 



Electricity as Power By Francis P. Upton, Menlo Park, N. J. 



Diatomacese v. Desmidiaceae (a Note) ...By Professor H. L. Smith, Hobart College, N. Y. 



Practical Value of Science, (Huxley); Antipatharia of the "Black" Expedition; Electrical Insecis ; Boston 

 Society of Natural History ; Recent Discoveries in Italy ; The Statue of Leibnitz ; Visit of Dr. Carpenter to the 

 Umted States ; Reports of American Archaeology; Icthyophagous Club ; Improved Thermo-Electric Apparatus, by 

 R. H. Ridout, Esq.; Errors of Refraction in the Eyes of Microscopists, by Dr. John C. Morgan; Stars of the 

 Southern Hemisphere, by Mr. Stone, F. R. S. ; The Nebula in the Pleiades ; The Emmett County Meteorite ; Natural 

 History Notes ; Microscopy ; Notes on Electricity ; Notes and Queries ; General Notes. 



OFFICES: 229 BROADWAY, NEW YORK. 



