APPARATUS, MATERIAL, AND REAGENTS. 



(J) APPARATUS FOR PREPARATION OF SOLIDIFIED STERILE 

 BLOOD-SERUM. 



Glass Jar. A tall cylindrical glass jar, on foot, with a broad 



ground stopper, for receiving blood. 



Pipette. An ordinary or graduated pipette, for transferring the- 



seruin from the jars to sterile test-tubes or glass capsules. 



Koch's Serum Ster- 

 iliser. A cylindrical case, 



with double walls forming an 



interspace to contain water, 



closed with a lid, also double- 

 walled and provided with a 



tubular prolongation of the 



enclosed water-chamber (Fig. 



262). The water in the 



cylinder is heated from below, 



and that in the lid by means 



of the prolongation. 



In the centre of the 



cylinder is a column which 



communicates with the water- 



charnber of the cylinder, and 



from it pass four partitions, 



which serve to support the 



test -tubes. 



In the lid are three 



openings, one of which communicates with the water-chamber in the 



lid by which the latter is filled, and into which a thermometer is 



then fixed. In the centre an 

 opening admits a thermo- 

 meter, which passes into the 

 central pipe of the cylinder ; 

 through a third opening a 

 thermometer passes to the 

 cavity of the cylinder. The 

 cylinder and cover are jacketed 

 with felt, and the apparatus 

 is supported on iron legs. 



FIG. 263. -SERUM INSPISSATOR. Koch's Serum Inspis- 



sator. A shallow tin case 

 with glass cover, both case and cover jjucketed with felt (Fig. 263) 



FIG. 262. KOCH'S SERUM STERILISER. 



