226 DISEASES OF POULTRY. 



quinine and sulphate of iron, of each one grain. Mix 

 and make into pills with a small quantity of syrup. 

 Give at one dose fpr fowls, and for pigeons one-third 

 the quantity. Another tonic is made by mixing 

 Sulphate of iron 45 grains with carbonate of soda, 

 finely pulverized, 1 dram, honey or syrup sufficient for 

 proper consistency. It is divided into 50 pills. 



Vaccination has been practiced successfully by I,oir 

 and Ducloux. The weaker vaccine is made by heat- 

 ing cultures of the bacilli to 55 degrees C. for half an 

 hour. A dose of one cubic 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- 

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

 sist the contagion. 



It has recently 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 be re- 

 turned to the flock for thirty days after they have 

 apparently recovered, otherwise they may still com- 

 municate contagion. 



INFECTIOUS LEUKv^jMIA. 



A disease of fowls which appeared to be quite com- 



