Artificial Mothers' Milk. 125 



keeping for three hours at Df, , then heating to 212° 

 for another half hour, theri cooling to 64° for ten 

 hours, then a final heating to 212° for forty-five min- 

 utes, and the cooling off to 58° as rapidly as the 

 bottles will stand. This rule for sterilizing should, 

 however, not be considered as fixed and unchangeable, 

 but it should be left to the investigation of the indi- 

 vidual manufacturer of normal infants' milk to find 



Fig. 20-AUTOMATIC SEALING CAP. 



out, by trials, if the bacteria predominating in his 

 milk will allow of a modification or simplification of 

 the heating and cooling periods. 



If the entrance of steam has been properly tem- 

 pered the breakage of bottles should be very small ; 

 if, in spite of all care, there should result more than 

 one per cent, of breakage, then the glass is too brittle, 

 the bottles have been too rapidly cooled after manu- 

 facturing them. Before the second heating is com- 

 menced the hood is lifted and the bottles are inspected. 



