146 BACTERIA IN DAILY LIFE 



in the months of July, August, and September fed 

 on raw milk reached 69*3 per 1,000, whilst amongst 

 those supplied with sterilised milk it was reduced 

 to 27-9 per 1,000. 



Just, however, as all is not gold that glitters, so 

 all sterilised milk so-called is not necessarily free 

 from bacteria. Indeed, according to a recent 

 German authority, "the complete and certain 

 sterilisation of milk is not yet to hand." 



Dr. Weber examined the sterilised milk as 

 supplied by various companies in the city of 

 Berlin. As many as 150 bottles were tested from 

 eight different sources, with the result that not 

 one of these eight companies was found to be 

 supplying milk free from bacteria, or, in other 

 words, what it professed to be sterile. True, 

 the percentage of sterile bottles varied from 5 per 

 cent, in some of the supplies to 86 per cent, in 

 others. 



Thus it may be realised how, as has been already 

 pointed out, difficult a matter it is to devise an 

 efficient apparatus for the reliable sterilisation of 

 milk. So far it appears that the best results have 

 been obtained with an apparatus devised by 

 Flaack, a director of the Brunswick Sterilising 

 Milk Company, and known as the Flaack apparatus. 

 Exhaustive examinations made during the course 

 of a whole year in the Hygienic Institute at 



