144 MODERN BIOLOGIC THERAPEUSIS 



20 m.m. safe for a blood pressure of 110 m.m. 

 of mercury or over for an adult; and for chil- 

 dren the same relative fall may be allowed. 



Adjusting the Apparatus After the fluid has 

 been withdrawn, the glass cylinder is attached 

 to the needle which is left in position; and the 

 serum, having been gently warmed to body tem- 

 perature, is allowed to flow into the spinal cavity 

 by gravity. (Care must be exercised not to heat 

 the serum above 98.6 F., otherwise it may coag- 

 ulate!} The adjustment 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 rubber 

 cap from upper end of cylinder until serum es- 

 capes from metal tip of rubber tubing (thus ex- 

 pelling all air from tubing) ; then replace the 

 cap and firmly insert the metal tip of rubber 

 tubing into hub of needle. Now remove the 

 rubber cap from upper end of glass cylinder, 

 and adjust the rubber portion of rubber-and- 

 glass union to exposed end of the glass cyl- 



