140 THE MICROSCOPE. 



THE MICROSCOPE. 



New Series, 1893. 



For Naturalists, Physicians, and Druggists, and Designed to Popularize 



Microscopy. 



Published monthly. Price $1.00 per annum. Subscriptions should end 

 •with the year. The old series, consisting of 12 volumes (1881-1892), ended 

 zuith December, 1892. Sets of the old series cannot be furnished. All 

 correspondence, exchanges, and boohs for notice should be addressed to the 

 Microscopical Publishing Co., Washington, D. C, U. S. A. 



CHARLES W. SMILEY, A. M., EDITOR. 



EDITORIAL. 



Prices of Drugs. — The average price of drugs is 3? times as 

 much in the United States as in Denmark. What costs 75 cents 

 in New York can be bought in Copenhagen for 20 cents. In 

 Norway, Sweden, Belgium, Germany, Austria, Holland, Hun- 

 gary, Switzerland, and Portugal, the prices of drugs average less 

 then half what they average in the United States. 



Pork Packing. — One firm in Chicago, during 1892, packed 

 the meat from 1,189,498 cattle ; 1,134,692 hogs ; and 1,013,527 

 sheep. The sales amounted to 890,000,000. We have written 

 to the firm to ask what microscopical methods they employ for 

 detection of trichinae and other diseases affecting meat and hope 

 to be able to publish an interesting account. 



QUESTIONS ANSWERED. 



Note. — Dr. S. G. Shanks, of Albany, N. Y., kindly consents to receive all sorts of ques- 

 tions relating to microscopy , ivhethc asked by professionals or amateurs. Persons of ah 

 f ades of experience , from the beginner upiuai d, are welcome to the benefits of this depart- 

 ment. The questions are numbered for Juture ; eference. 



168. Explain how to centre and use an Abbe condenser so as to get 

 the best illumination for ordinary objects and bacteriology ? — B. E, R- 



A condenser is centered by means of a cap, with a small cen- 

 tral perforation, slipped over the top lens. Use the plane mir- 



