108 MODERN BIOLOGIC THERAPEUSIS 



into the spinal cavity by gravity. (Care must 

 be exercised not to heat the antitoxin above 

 98.6 F, otherwise it may coagulate!} The ad- 

 justment of glass cylinder to needle is effected 

 in the following manner : 



Withdraw the soft cotton cord from the rub- 

 ber tubing (the cord prevents collapse of tub- 

 ing while in the package) ; remove one of the 

 rubber caps from the glass cylinder and slip 

 rubber tubing over the exposed end of cylinder. 

 Hold the cylinder vertically and remove rub- 

 ber cap from upper end of cylinder until anti- 

 toxin escapes from the metal tip of rubber tub- 

 ing (thus expelling all air from tubing) ; then 

 replace the cap and firmly insert the metal tip 

 of rubber tubing into hub of needle. Now re- 

 move the rubber cap from upper end of glass 

 cylinder, and adjust the rubber portion of rub- 

 ber-and-glass union to exposed end of the glass 

 cylinder. (The cotton filter, in glass portion of 

 union, prevents any foreign matter from gain- 

 ing access to, and contaminating the antitoxin.) 

 From 10 to 25 minutes should be allowed for 

 the antitoxin to be introduced into the spinal 

 canal. The flow may be increased or decreased 

 by raising or lowering the glass cylinder. If 



