44 



THE AMERICAN MONTHLY 



[Feb., 



ing), and historical introductions in Hansen's papers. 

 Belohoubek : Dr. Emil Christian Hansen, eine biogra- 

 phische Skizze. (Zeitschril't fur dasgesainmte Brauwesen, 

 1889, No. 24. 



copper wire. 



A 



A NEW INFECTION NEEDLE.^ 



The needle itself consists of brass or 

 This material is, as a general rale, 

 as good as platinum, provided that it 

 is taken care of, and not allowed to 

 become oxydized. It is passed through 

 the center of a metal disc (f) and its 

 lower part is surrounded by a glass 

 tube (g). The disc can move between 

 two stoppers (b and d) ; above the for- ^^ 

 mer of these, we have the grip (a). 

 This is connected with the glass tube // 

 by a spring which under normal cir- 

 cumstances holds the instrument in 

 the position A. 



When the needle is to be used, the 

 upper part of the glass tube is charged 

 with cotton. A cotton stopper is also 

 placed in the' tube (e). The outside 

 cotton wrapper should have the same 

 size as the opening of the flasks. The 

 general object is to "make a transfer" 

 from one flask to another. For this 

 purpose, the cotton stopper in the 

 original flask is, by means of the left 

 hand, removed from the opening, and 

 in the next moment, the needle is 

 pushed in; the cotton wrapper filling 

 the whole opening and thus prevent- 



* rhe general idea was presented before the A. A. A. S., Sec. G., at Mad 

 in August, 1893. 



ison, 



