12 
The Colorado Experiment Station. 
Calf Diphtheria, Lower Jaw; a, two large ulcers. See page .13. 
Colorado soil, where animals are kept, and may at any time produce 
serious disease in our young animals. It differs from many other 
disease producing bacteria, in that it does not multiply when ex¬ 
posed to the air, thus it must get in below the surface of the skin 
or mucous membrane before it can produce serious trouble. 
While a wound is necessary for the entrance of the organism, 
it must not be concluded that this wound need be one that is readily 
seen. When we consider that the germ could enter an abrasion 
that was not over one-twenty-five thousandth of an inch in diameter, 
it can be readily appreciated that wounds are liable to be present 
in the mouth at any time that are of sufficient size to allow the dis¬ 
ease to get a foothold. Especially is this true when animals are 
