24 BACTERIOLOGY. 



Carbonate of Soda. A bottle, containing a 

 saturated solution of carbonate of soda, and 

 provided with a pipette-stopper, may be kept, 

 especially for use in the preparation of nutrient 

 jelly. 



Lactic Acid. 



Filter Paper. For filtering gelatine stout 

 Swedish filter paper of the best quality is re- 

 commended. 



Flannel or Frieze. This is employed as a 

 substitute for, or combined with, filter paper in the 

 preparation of nutrient agar-agar. 



(H) APPARATUS FOR EMPLOYMENT OF NUTRIENT 

 JELLY. IN TEST-TUBE AND PLATE CULTIVATIONS. 



Wire Cages. These cages or crates are 

 used for containing test-tubes, especially when 

 they are to be sterilised in the 

 hot-air steriliser ; or for lowering 

 tubes of nutrient jelly into the 

 steam steriliser, etc. (Fig. 5). 



Test-tube Stands. The or- 

 dinary wooden pattern, or the 

 metallic folding stands, are 

 FIG. S.-WIRE CAGE called into use for holding- cul- 



FOR TEST-TUBES. 



tivations. Pegged racks are 

 also recommended for draining test-tubes after 

 washing. 



