40 DEPAETMENT OF AGRICULTURE GEORGIA. 



ter be amended. In fully developed cases the worms must be re- 

 moved by introducing a loop of horsehair into the trachea, or wind, 

 pipe, and turning it round during withdrawal, the operation to be 

 repeated several times till all the worms appear to be extracted. A 

 feather, stripped almost up to the top, may be used instead of the 

 horsehair.'' 



CHOLERA 



has been the especial scourge of the poultry yards of the South, 

 and until recently has baffled the skill of all investigators. Dr. D. 

 E. Salmon, of the Veterinary Division of the Unitec^tates Depart" 

 ment of Agriculture, has for several years been pursuing a sys- 

 tematic, scientific investigation of this disease with very instructive 

 results. He has succeeded in cultivating the virus containing the 

 germs of the bacteria, which cause the disease, and by diluting it 

 in different degrees has been able by inoculation to produce the 

 disease at will in virulent or mild form according to the strength 

 of the virus used. 



The theory on which he proceeds is, that by successive cultiva- 

 tions he will so far weaken the virus as to be able to produce by 

 inoculation effects similar to those resulting from vaccination of hu- 

 man beings. 



All medical treatment failed even in his skillful hands. He found 

 that the germs of the bacteria, voided in the excrement of diseased 

 fowls, retained vitality and was capable of producing the disease in 

 fowls fed upon the flesh of dead birds that had been frozen. He 

 found also that the virus, after six successive cultivations in a flask 

 prepared for the purpose, had lost but little, if any, of its virulence. 



His experiments showed that burial of the fowls, that had died 

 with cholera, for six months destroyed the germs of the bacteria. 

 He expresses the opinion that putrefaction destroys the germs, but 

 when protected from this, as in the case of frozen flesh, vitality is 

 retained. Under the head of 



THE EFFICIENCY OF DILUTED SULPHURIC ACID AS A DISINFECTANT. 



Dr. Salmon says : 



"The solution of commercial sulphuric acid of the strength of 

 one part to two hundred of water, which I have heretofore recom- 

 mended as a cheap and most efficient disinfectant in this disease, has 

 been in continual use during these experiments. I have shown in 



