40 SCIENCE BULLETIN, No. 20. 



the source of supply a well) were examined and found to be heavily 

 polluted, among other organisms present being members of the coli and 

 p rote us groups evidence of surface contamination. 



The manager of the company, on being advised of the results of the first 

 examination, caused shafts to be sunk in various directions round and 

 more or less distant from the factory. ' Samples of the water thus obtained 

 were sent to the Department, and on examination they were found to be 

 similarly infected to the sample first sent in. On inquiry it was ascertained 

 that this factory is situated in the midst of low-lying swampy country, the 

 underground supplies of water evidently having soaked through the surface - 

 soil. The directors of the company have now decided to remove the factory 

 to a site where a purer water supply can be obtained a commendable step. 



A good water supply is an absolute essential to the manufacture of good 

 butter. Now that pasteurisation has been generally adopted in order to 

 kill off or prevent the development of injurious organisms that have obtained- 

 access to the milk or cream, it is manifestly the height of folly to allow a s 

 fresh infection to take place by washing the butter in the churns with con- 

 taminated water. A water-filtering plant should form part of the equipment "^ 

 of every factory. In the majority of cases it would remedy matters ; 

 if not, a new and clean supply should be obtained if at all possible. Even if 

 the factory had to be removed, it would be an expenditure well undertaken. 



Sydney : William Appkgate Gullick. Government 1'rinf.cr 1921. 



