42 APPLIED BACTEEIOLOGY 



maintained uniform within half a degree without readjust- 

 ment of any part for months together, and this, too, in 

 defiance of great changes of gas-pressure, and of air- 

 temperature in the room in which the apparatus is 

 working. 



Instructions foe starting an Incubator regulated with 

 A Capsule and an Excelsior Valve. 



These instructions must be carried out in the order in 

 which the paragraphs are numbered. 



1. On receiving the apparatus, and having examined it 

 and found it perfect, place it where it is to stand, and make 

 a connection between the pipe A (Fig. 8) and the gas- 

 service, but do not light the gas. 



2. Look up under the apparatus, and on the right-hand 

 side you will see an open-ended pipe. On the bench below 

 this place a basin to receive the overflow. 



3. In like manner under the left-hand side you will find 

 the emptying-pipe furnished with a cock, which must be 

 closed whilst the incubator is in use. 



4. Open the doors of the incubator, and do not close 

 them again until the following instructions have been 

 carried out. 



5. Fill the tank with warm water at the filling- tube in 

 the top of the incubator until it runs out at the overflow 

 below, and add a small quantity weekly, if necessary, to 

 compensate for evaporation. 



The middle row of figures written on the ticket pasted 

 inside the door indicates on Fahrenheit's scale the tempera- 

 ture at which the capsule begins to boil. The water used 

 to fill the tank should be at least 5° colder than this, and 

 the temperature should be taken before the water is poured 

 into the tank. 



