44 Dairy Bacteriology. 



suits. This in itself is practically a guarantee of the ab- 

 sence of those forms liable to produce trouble in children. 

 De Schweinitz 1 has made a series of examinations ex- 

 tending throughout a year on such a sanitary dairy in 



FIG. 19. Bacterial content of milk handled in ordinary way. Each spot rep- 

 resents a colony growing on gelatin plate. Compare with Fig. 13, where same 

 quantity of milk is used in making culture. Over 15,000 bacteria per cc. in this 



Washington. The average of 113 samples was 6,485 or- 

 ganisms per cc. The following figures for a week in sum- 

 mer are taken from the regular analytical records of a 

 Philadelphia firm that makes a specialty of children's milk. 



July ............... 1234 567 



No. bacteria per cc.. 525 1,050 125 2,450 1,250 475 2,100 



From a practical point of view, the improvement in 

 quality of sanitary milk, in comparison with the ordinary 

 product is seen in the enhanced keeping quality. During 



De Schweinitz, Nat. Med. Rev., Apr. 1899. 



