SCIENCE. 



[Vol. XV. No. 386 



OUR 



Midsumffler Stock-Taking Sale of 

 SILKS, 



In our Departments on the Main Floor and in 

 the Basement, will commence on Monday, June 

 23, and continue until July 3. 



Seasonable and desirable assortments of Silk 

 Fabrics will be offered, daily, at, prices that are 

 designed to secure a complete disp'osal'o/ our 

 Spring and Summer Stock before the inventory. 



Ladies desiring such fashionable ajid useful 

 Fabrics as Washing Silks, India and China Silks, 

 Surahs, Louisiennes, in both Plain and Fancy, 

 Black and Colored Silks, Velvets, etc., will find 

 this a very interesting opportunity. 



JAMES M'CIIEEIIY& CO., 



BROADWAY AND ELEVENTH STREET, 



t-ibi-. 



NKW YORK. 



'^-^.V, 



'*^«Vo, 





^''Jn, 



'«»/ 



GEMS AND PRECIOUS STONES OF 

 NORTH AMERICA: 



A popular description of their occurrence, value, 

 history, archeeology, and of the collections in 

 which they exist; also a chapter on pearls, and on 

 remarkable foreign gems owned in the United 

 States. By George Frederick Eunz, Illustrated 

 with eight colored plates and numerous engrav- 

 ings. Price, $10. 

 Mr. Kunz, who is well known as an authority upon 



the subject of gem stones, and who is the expert for 



Tiffany & Co., possesses peculiar facilities for the 



preparation of a work of this kind. 



Sent postpaid on receipt of price. 

 N, ». C, nODOES, 47 liafayette PI., N. Y, 



BOOKS: How to get tliem. If there is any 

 book or paiffuphlet that you want, write to the Science 

 Book Agency, 47 Lafayette Place, New York. 



THE 



I 



COMPANY. 



98 MILK ST., BOSTON, MASS, 



Tills Company owns the Letters 

 Patent granted to Alexander Gra- 

 ham Bell, March 7th, 1876, No. 

 174,465, and January 30, 1S77, 

 No. 186,787. 



The Transmission of Speech hy 

 all known forms of ELECTRIC 

 SPEAKING TELEPHONES in- 

 fringes the right secured to this 

 Company by the ahove patents, and 

 renders each individual u»er of tel- 

 ephones, not furnished by it or its 

 licensees, responsible for .»>uch un- 

 lawful use, and all the conse- 

 quences thereof and liable to suit 

 therefor. 



PHYSICAL, ELECTRICAL 

 AND CHEMICAL 



APPARATUS 



Of High Grade. 



FOR SCEIOOL.S AND COLLEGES. 

 Send for List of Catalogues. 



QUEEN & CO, Philadelphia. 



At Siasconset, Nantucket Island, 



36 FURNISHED COTTAGES. 



$120 TO $275 THE SEASON. 

 Ocean views; surf bathing; no hot days, malaria or 

 mosquitoes. Circulars. 



DOUBLEDAY, 



39 Ann Street, New York. 



jomr BASTmss, iosefb imp, ceas. s. lawseitce. 



Pres. fi^* Treas. Vice Pres. ^ Secretary. 



^[ Gen. Manuger. 



FOR 



AND ADVERTISINQ 



NEW YOR.I^'a 



THE MDTDAL LIFE 



INSURANCE COMPANY 

 OF NEW YORK. 



RICHARD A. McCUKDY, President. 



THE LARGEST, BEST AND MOST POPULAR 



LIFE INSURANCE COMPANY IN 



THE WORLD. 



Assets January 1st, 1890, $136,401,328.02 

 New Business in 1889, - 151,602,483.37 

 Annual Income, - - - 31,119,019.62 



Ptirely MtUiial. 



No Stocklwlders. 



NO OTHER COMPANY HAS SHOWN 

 RESULTS SO PROFITABLE AND GRAT- 

 IFYING TO POLICY-HOLDERS. 



ITS POLICIES ARE THE MOST 



LIBERAL AND DESIRABLE 



ISSUED. 



It lias Paid Policy-holders since Organization 

 $287,681,948.20. 



The Twenty Year Distribution Policy 



issued by The Mutual Life Insurance 



Company is a Model Contract. 



The Company's Policies are now held by 

 182,310 Members. 



ESTERBROOK'S 

 STEEL PENS. 



Of SVPERlOn AND 'STANDARD QUALITY. 

 Leading Nos.; 048, 14, 130, 135, 239, 333 



For Sale by all Stationers. 



THE ESTERBROOK STEES. PEN CO., 



WorkB : Oamden. N. J. '^6 Joliu St., Sew York. 



MINERALS. 



Cabinet Specimens and Collections. 



When in New York do not fail to visit our New 

 York store. On account of our very large stock we 

 are able to keep there as well as in Philadelphia a 

 very fine selection of choice Mineral Specimens. 

 Send for Complete Catalogue, Free. 

 GEO. L. EKGLISH t& CO.. Oeolers in Minerals, 

 1512 Chestnut St., Philadelphia. 

 7.39 & 741 Broadway, New York. 



