THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



YOL. I. 



ISTew York, August, 1880. 



No. 8. 



A new Injecting Apparatus. 



I send you herewith a diagram 

 of an injecting apparatus designed 

 and arranged by Mr, Justin^pauld- 

 ing, of this town, which will be 

 found to be very simple in con- 

 struction, eas}#)f nianipulation, and 

 I think the most 1)erfect in opera- 

 tion of any yet 

 contrived. The 

 amount of pres- 

 sure is under 

 perfect coijp 

 trol, and can be 

 maintained at a 



fiven point, or 

 iminished or 

 increased at 

 pleasure. 



A is an or- 

 dinary wide- 

 mouth bottle 

 (of any conve- 

 nient size or 

 shape) connect- 

 ing by a glass 



Fig. 23. 



^ ^ tube and rubber 



pipe {11) with an aqueduct faucet, 

 or with the taj) of a vessel of water 

 at an elevation. J E \& a glass 

 tube with an elastic pipe leading 

 to a small vial containing mer- 

 curv {G), and a tube {N) througli 

 which the mercury rises and in- 

 dicates the pressure employed, upon 

 an index {D). F K is, 2l simi- 

 lar pipe and tube connecting with 

 the bottle B, containing the inject- 

 ing fluid, which is forced into the 

 specimen through the pipe and tube 

 G 0. The most important improve- 

 ment over other similar arrange- 



ments is the addition of tlie bent 

 glass tube Z, terminating in a small 

 aperture (Z), which permits the 

 constant escape of a small (juantity. 

 of the water (3/), and thus acts as a 

 governor to maintain a constantly 

 even pressure. 



Tlie connecting rubber pipes E, 

 F, II, 0, may 

 be of any con- 

 venient length, 

 and the cost 

 of the entire 

 apparatus need 

 not exceed one 

 dollar, with the 

 exception of 

 the pipe and 

 stop-cock Gf 

 and by using 

 a spring-clip to 

 constrict the 

 rubber pipe 

 this may be dis- 

 pensed with, 

 of course, regu- 



- -^^ N->e 



The pressure is 

 lated at the faucet which supplies 



P P ■ John D. White. 

 Springfield, Mass., May, 1880. 



A Useful Culture-cell. 



BY GEORGE M. STERNBERG, SURGEON 

 U. S. A. 



While in Havana, last Sunmier, 

 as a member of the Havana Com- 

 mission for the investigation of yel- 

 low fever, I made a large number 

 of culture experiments, for the pur- 

 pose of ascertaining whetlier any 



