Bacteria and Butter Making-. 



159 



ful method of treatment of tubs is to apply paraffin to 

 the inner surface, which can be easily done by the use of 

 some one of the various machines now on the market. 





FIG. 34. MOLDY BUTTER. 



The butter was placed in a paraffined tub, but the paper was 

 not treated so as to destroy the mold spores thereon. 



