FROM THE PRACTICAL VIEWPOINT 



of the body may be strained or broken. In such 

 case the disease known as "the bends" results. It 

 has been proposed that a machine might be so con- 

 structed that an abnormal air pressure upon the 

 milk could be suddenly released, thus allowing the 

 air within the germ bodies to quickly expand and 

 so destroy them. No such system has been made 

 commercially available. 



