LABORATORY WORK IN DAIRY BACTERIOLOGY 



cells as to size and shape with bacteria already studied. Hunt 

 for cells showing budding. If these are not found they may be 

 obtained in quantity by planting a little yeast in a weak solution 

 of molasses in water and allowing to grow for a few hours in 



FIG. 8l CENTRIFUGE FOR MILK TESTING 

 (International Instrument Co.) 



a warm place. Make a sketch of the yeast cells with buds, 

 showing their relative size to that of bacteria. 



No. 17. Direct Microscopic Study of Milk. For this a 

 centrifuge is needed, having tubes with straight sides, and closed 

 at the bottom with a rubber cork. (Fig. 81.) Place 2 c.c. of 

 the samples of milk to be tested, after thorough shaking, in the 

 tubes. It is necessary to fill enough tubes with milk from dif- 



