226 DISEASKS OF POULTKV. 



(|uinine and sulphate of iron, of each one grain. Mix 

 and make into ])ills with a small quantitj^ of syrup. 

 Cj'wl' at one dose for fowls, and for pigeons one -third 

 the quantity. Another tonic is made by mixing 

 suli)hate of iron 45 grains with carbonate of soda, 

 finel}' pulverized, 1 dram, honey or syrup suf^cient for 

 ])roper consistency. It is divided into 50 pills. 



\'accination has been practiced successfully by Loir 

 and Ducloux. The weaker vaccine is made by heat- 

 ing cultures of the l)acilli to 55 degrees C. for half an 

 hour. A dose of one cui)ic centimeter of such vaccine 

 injected under the skin of fowls causes only a slight 

 elevation of temperature and confers a certain degree 

 of immunity. These birds are then inoculated with 

 one cubic centimeter of a culture of the bacilli two 

 months old. This second vaccination raises the im- 

 raunit}' to such a degree that the birds are able to re- 

 sist the contagion. 



It has recentl}' been proposed to treat birds with the 

 same antitoxin that is made for human diphtheria, 

 and very successful results are claimed for such treat- 

 ment. It is just possible that this conclusion may be 

 confirmed; but the almost unanimous testimony of 

 bacteriologists that the germs of the human and avian 

 diseases are entirely distinct makes such confirmation 

 very doubtful. 



For further suggestions as to treatment the reader is 

 referred to the article on contagious catarrh. 



Fowls which have been affected should not l)e re- 

 turned to the flock for thirty days after they have 

 apparently' recovered, otherwise they may still com- 

 municate contagion. 



INFECTIOUS LEUK.4^:MIA. 



A disease of fowls which appeared to be c|uite com- 



