A1TAR.VITS, MATKKIAL, AND REAGENTS. 



(J) APPARATUS FOR PREPARATION OP 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 

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



Koch's Serum Ster- 

 iliser. A cylindrical ra>r. 

 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- 

 chamber 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 



FIG. 262. KOCH'S SERUM STERILISER. 



thermometer passes to the 

 cavity of the cylinder. The 

 -r Under and cover are jacketed 

 with felt, and the apparatus 

 i> supported on iron legs. 



Koch's Serum Inspis- 

 sator. A shallow tin case 

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



FIG. 2G3. SKI.I.M INM-ISSATOR. 



