THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL 



YOL. I. 



New Yokk, August, 1880. 



No. 8. 



A new Injecting Apparatus. 



I send you herewith a diagram 

 of an injecting apparatus designed 

 and arranged by Mr. Justin Spauld- 

 ing, of this town, which will be 

 found to be very simple in con- 

 struction, easy of manipulation, and 

 I think the most perfect in opei'a- 

 tion of any yet 

 contrived. The 

 amount of pres- 

 sure is under 

 perfect con- 

 trol, and can be 

 maintained at a 

 given point, or 

 diminished or 

 increased at 

 pleasure. 



A is an or- 

 dinary wide- 

 mouth bottle 

 (of any conve- 

 nient size or 

 shape) connect- 

 ing by a glass tube and rubber 

 pipe (11) with an aqueduct faucet, 

 or with the tap of a vessel of water 

 at an elevation. -/ ^ is a glass 

 tube with an elastic pipe leading 

 to a small vial containing mer- 

 cury (C), and a tube (JV) through 

 which the mercury rises and in- 

 dicates the pressure employed, upon 

 an index (D). F K \^ a simi- 

 lar pipe and tube connecting with 

 the bottle JB^ 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 /, terminating in a small 

 aperture (Z), which permits the 

 constant escape of a small quantity 

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

 governor to maintain a constantly 

 even pressure. 



The connecting rubber pipes E, 

 F^ H, 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 G, 

 and by using 

 a spring-clip to 

 constrict the 

 rubber pipe 

 this may be dis- 

 pensed with. 

 The pressure is, of course, regu- 

 lated at the faucet which supplies 

 the pipe H. j^^^ ^ ^^^^^_ 



SpkinctFIEld, Mass., May, 1880. 



A Useful Culture-cell. 



BY GEORGE M. STERNBERG, SURGEON 

 U. S. A. 



While in Havana, last Summer, 

 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 whether any 



