SCIENCE 



A WEEKLY RECORD OF SCIENTIFIC PROGRESS. 



ILLUSTRATED. 



Entered in the Office of the Librarian of Congress, at Washington, D. C. 



No.79.—Vol.II. December 31, 1881. Price 1 O Cents. 



IMPORTANT NOTICE. 



Lancaster, November ist, 1 88 1. 



Dear Sir: 



We hereby inform you that we have this day constituted 



MESSRS. JAMES W. QUEEN & CO., 



" OPTICIANS, 



PHILADELPHIA, PA., TO BE OUR BUSINESS AGENTS. 



to whom, until further notice, we shall consign the whole product of our factory. 



Messrs. QUEEN & CO. will fill all orders and reply to all inquiries for 

 our Microscopes and Accessory Apparatus, therefore all letters on these subjects 

 should be addressed to JAMES W. QUEEN & CO., Agents for JOHN W. 

 SIDLE & CO., 924 Chestnut Street, Philadelphia. 



Truly Yours, 



JOHN W. SIDLE & CO. 



Every " Acme Microscope," before being issued from the manufactory, will 

 pass through a careful examination and will be thoroughly tested, and again 

 undergo a like examination before passing from our hands. 



An Illustrated Circular giving prices and other information in reference to 

 the " Acme Microscopes " will be forwarded on application. 



JAS. W. QUEEN & CO., 



924 Chestnut Street, Philadelphia. 



