248 DISEASES OF TRUE INFECTION. 



time. This consists of making a solution of the spinal matter of 

 the suspected animal in distilled water. The emulsion which is 

 thus obtained is filtered through a piece of linen and brought in 

 contact with the anterior chamber of the eye of the animal which 

 is to be inoculated. They do this by means of a small hypodermatic 

 syringe, having first placed cocaine on the cornea, and then inject 

 the solution direclly-into the anterior chamber. If the suspected 

 animal was rabid, we will see the development of the disease in 

 from fourteen to seventeen days, even if the chamber should sup- 

 purate from the irritation of the injected solution. Gal opposes 

 this procedure by pointing out the fact that the stage of incuba- 

 tion may be greatly delayed. 



The following diseases are sometimes mistaken for rabies : Cer- 

 tain affections of the brain, teething, distemper, angina, intestinal 

 parasites, inflammation of the intestines, pentastoma in the nose 

 and frontal cavities, foreign bodies in the mouth (between the 

 teeth) or in the throat, paralysis of the lower jaw, luxation of the 

 lower jaw, intense excitement in bitches that have had their young 

 taken from them, and poisoning. The course of the disease, how- 

 ever, and the after-symptoms always enable one to make a differ- 

 ential diagnosis. Concerning the prophylactic measures, relating 

 to the prevention of the spread of this disease, there is great variety 

 in the state sanitary and police quarantine regulations, all of which 

 provide that the suspected animals shall be confined or muzzled 

 during three months, or killed immediately if protection is not pro- 

 vided by their owners. 



Tuberculosis. 



Under this name we class all affections which owe their origin to 

 a specific bacteria called the tubercle baccillus ; these are found in 

 all tubercular lesions, whether in animals or man. The tubercle 

 baccillus is an obligate ssrobic parasite having a slender rod-like 

 form often slightly curved and frequently a beaded appearance; 

 they are non-flagellated and measure from 3 to 7 microms long and 

 from 0.3 to 0.5 microms broad. The tubercle baccillus resists de- 

 struction for a long time; it has been known to live in dried sputa 

 for three months and produce the disease when inoculated into ani- 

 mals experimentally. Direct sunlight, however, destroys it in a 

 few hours, and diffuse light kills it in six or seven days; the Eoent- 



