BITTER MILK AND BITTER CHEESE. 329 



When inoculated into sterilised milk it produces a strongly bitter 

 flavour, and must, from its behaviour towards casein, be grouped 

 with Duclaux 5 Tyrothrix species. 4. Bacillus liquefaciens lactis 

 amari was found by FREUDENREICH (X.) in cream which had turned 

 bitter spontaneously. The relative dimensions of this motile 

 bacillus vary considerably : the most usual measurements are 0.5/0. 

 for the breadth and 1.5 y* for the length, but the latter may 

 extend to 6 /a. It induces coagulation in milk which it also 

 makes very bitter but no formation of acid takes place ; and it 

 liquefies gelatin. 



