APPARATUS, MATERIAL, AND REAGENTS. 29 



bladed knife set in a wooden handle is sold for 

 this purpose. 



Scalpels. Half a dozen scalpels, preferably 

 with metal handles, may be kept especially for 

 inoculating sterilised potatoes. 



Brush. A common stout nail-brush, or small 

 scrubbing brush, is essential for cleansing potatoes. 



(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 serum 

 from the jars to sterile 

 test-tubes or glass cap- 

 sules. 



Serum-Steriliser. 

 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 en- 

 closed water chamber 

 (Fig. 14). The water 

 in the cylinder is heated 

 from below, and that in the lid by means of the 

 prolongation. 



FIG. 14. SERUM STERILISER 



