DISEASES OF FARM ANIMALS 209 



slender, spore-producing bacterium. The spore is 

 located at one end of the rod in the form of a round 

 head, that gives the organism a pin shape, hence 

 the name of pin bacillus. It is very resistant to 

 outside conditions and the action of the chemical 



LOCKJAW 

 Note the rigid, tense position of the muscles. 



disinfectants. It is because of its .ability to resist 

 the action of disinfectants and the fact that it 

 develops best when protected or covered by the 

 tissues and wound secretions, that this disease so 

 often follows ordinary wound treatment. 



From a few days to several weeks may lapse 

 from the time of infection with the germs until the 

 development of the stiffness and spasms. Some- 

 times the wound by which the organism has en- 

 tered the tissues has healed before the symptoms of 

 tetanus are manifested. In case the symptoms de- 

 velop a few days after the inoculation the disease 



