128 



.1 New Dairy Industry. 



same percentage of nourishing ingredients whenever 

 it may be analyzed by a chemist. 



Cow's 

 Milk. 



3-5 



3.0 



O.fi 

 4.S 

 0.7 



To exclude all possibility of pollution by bacteria 



floating in the air of the 

 laboratory (the mixing or 

 the sterilizing localities) a 

 disinfection of these prem- 

 ises should periodically be 

 instituted. The safest and 

 simplest way is by apply- 

 ing the fumes of formic 

 aldehyd, a gas which kills 

 all floating bacteria or 

 germs. The lamp by which 

 these fumes are generated 

 is shown at Fig. 21. The 



Fig. 21-DISINFECTING LAMP. vessd j g fil]ed whh methyl 



alcohol and the wick covered by a cap made of 

 platina wire netting. After lighting the wick and 

 waiting to see the platina netting become red hot, the 

 flames is blown out when the glowing of the wire 





