Artificial Mothers' Milk. 125 



keeping for three hours at 95, then heating to "212 

 for another half hour, then cooling to 04 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 



B 



Fig. 20-AUTOMATIG 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. 



