76 BACTERIOLOGY. 



bouillon containing 1 per cent, of grape-sugar, and three 

 parts of blood-serum. This mixture is placed in test- 

 tubes, sterilized, and solidified in exactly the way given 

 for blood serum. 



Gfuarniari' s agcir-gelatin : 



Meat-infusion . 950 c.c. 



Sodium chloride ..... 5 grammes. 



Peptone 25-30 " 



Gelatin 40-60 " 



Agar-agar 3-4 " 



Water 50 c.c. 



The point in the preparation of this medium is its 

 reaction, which should be exactly neutral. 



The list of special media is too great to be given in a 

 work of this size. Their description must be seen in the 

 original. Those which have been given above will 

 suffice for obtaining a clear understanding of the prin- 

 ciples of the work. 



NOTE. The term " meat-infusion " always implies a 

 watery extract of meat made by mixing 500 grammes of 

 finely-chopped lean meat and 1 litre of water together, 

 and allowing them to stand in a cool place for twenty- 

 four hours. At the end of this time the fluid portion is 

 strained off through a coarse towel. This represents the 

 infusion. 



