MICRO-ORGANISMS IN MILK 



287 



ing is most easily kept clean when it is smooth. Rafters should 

 be covered with matched lumber or plaster, so as to leave no open 

 places. Plastering the walls seems to be of no advantage, accord- 



I 



Fie. 94. Clean stables. 



ing to Harding, Ruehle, Wilson, and Smith, who have made 

 bacterial counts to ascertain this point. The work of these author? 



Fig. 95. Clean cans in clean stables. 



indicates that in freshly plastered stables the germ content of the 

 milk is higher than under the usual conditions. In a special case 

 the germ content before plastering was 44 per cent, lower than 



