104 
BACTERIOLOGY. 
mouth or in the throat. It starts as a nodule, hard 
at first, but later undergoes softening and finally sup¬ 
purates, causing a discharging sinus. Infections of 
the skin, lungs, intestines, and appendix have been de¬ 
scribed. The parasite is supposed to enter the body 
Fig. 13.—Actinomyces hominis (lung). X 350. 
( Lenhartz-Brooks .) 
in grain, oats, barley, or rye, and in cattle from hay 
or straw. 
The disease is not highly infectious, and all 
danger is removed by careful disinfection of the dis¬ 
charges containing the pus. 
Yeasts. 
Yeast-cells are much larger than bacteria; they 
are oval in shape and have a thick cell-membrane. 
