SCIENCE. 



in 



JEWETT'S 



Portable Crock Filter. 



PM. Nov. 16, ISH9, Oct. 15, IS7S. 



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 



. 73. * " " 



■ 74. " 16 " 



75. " " 26 " 



25 each. 



Q.25 

 11.00 

 13.00 

 15-50 



The Original and Genuine. 



ALL OTHERS ARE IMITATIONS. 



Over 1 00,000 now in use. 



Acknowledged the only complete Filter 

 \nd Cooler in the world. 



JEWETT'S 



1RTAHLE CROCK 



FILTER 



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, 

 and render the same of 



Sparkling Transparency 



and Purity. 



STAINED OAK. 



No. 61, Porcelain Reservoir, ^% quarts. 

 " 62. " ' 7» " - 



" 63, " 11 " - 



l * 64, kk 16 . 



" 65, " " 26 " 



$6.75 each. 

 8.75 " 

 10.50 

 12.50 " 

 15.00 lt 



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 si* years. Our sales 

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



BOARD OF HEALTH, Washington^ D. C.,Aug. 37, 1877. 



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

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

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



»C THE LARGE FILTER OF THE SAME MAKE 1'URCHASED FOR THE BOARD OF HEALTH. 



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



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



♦ or Sale hi New York City by KING, BRIGGS & CO., sq6 Broadway. J. H. BALDWIN & CO., 21 Muiray Street. L. HEYNIGER, 

 i& Fulton Street. CHARLES JONES, 920 Broadway. LEWIS & CONGER, 601 Sixth Avenue. 



SCIENCE 



-A. WEEKLY JOURNAL OF SCIENTIFIC PROGRESS 



Vol. II. No. 41, _______ April 9, 1881. 



CONTENTS. 



Uniform Time (Edit.) ; How to Obtain the Brain of the Cat, by Professor B. G. Wilder ; Atoms and Monads, their 

 Metaphysical Development, by Dr. Diodato Borrelli (Translation by the Marchioness Clara Lanza) ; Letters to the 

 Editor : Professor Wilder's Paper on Cerebral Nomenclature, by Dr. Edward C. Spitzka ; How Does Gravity Cause 

 Motion ? by Charles Morris ; Notes, Astronomical, Chemical, Physical, etc., etc., etc. 



Subscription, Four Dollars a Year. 



