264 



PRACTICAL DAIRY BACTERIOLOGY 



It may not always be possible for the student to follow the 

 order of experiments given. There is no necessity for following 

 the order given except that numbers i to 13 should precede 



all others. 



LIST OF APPARATUS NEEDED 



Steam sterilizer. 



Autoclav. 



Hot air sterilizer. A common gas 

 oven used for cooking will 

 do. 



Stew pan for cooking media. 



Flasks I liter and i l / 2 liter. 



Test tubes Board of Health pat- 

 tern. 



Petri dishes 4 inches in diameter. 



Pipettes i c.c., 2 c.c. A few larger 

 ones are also convenient. 

 Each of the smaller pipettes 

 should have a glass tube to 

 contain it, sealed at one end. 



Wire baskets to hold test tubes. 



Test tube racks. 



Burette holder and 4 burettes. 



Evaporating dishes. 



Measuring cylinders i liter and 

 100 c.c. 



Counting plate or counting card. 

 FIG. 68 TEST TUBES BOARD *OF Platinum wire to be fused into 



HEALTH PATTERN glags ^ 



Common tumblers are frequently more convenient than test 

 tube racks for holding test tubes. 



Culture oven, with constant temperature of 98. This is ex- 

 pensive and may be omitted. 



