NECROSIS. 145 



surrounded by primary inflammatory cbange. This affection 

 is therefore a true progressive necrosis of the skin. 



" From a careful investigation, there can be no doubt that 

 the disease is contagious, and, further, that the first cases of 

 disease amongst the young pheasants are due to infection by 

 the same necrotic disease of the hens used for rearing. It 

 ought to be stated that hens fowls in general are subject 

 to, and not unfrequently affected with, an infectious disease,, 

 which shows itself as necrotic degeneration of the mucous 

 membrane of the mouth and throat, and also of the skin 

 around the mouth occasionally, but not often, also of the 

 abdomen and chest. From inquiries which I instituted among 

 the keepers, I feel convinced that in this particular locality of 

 Suffolk the disease amongst the young pheasants was thus 

 introduced, viz., by some diseased hens used for the rearing. 

 It is obvious that if one hen is affected with the disease, 

 the little pheasants that she is rearing are sure to contract it 

 also, and these when affected, soon, in their turn, scatter the 

 contagium over different parts of the field. When a hen is 

 affected on the skin of the abdomen and chest, or when she 

 has the disease in the mouth, sufficient of the contagium 

 becomes available for the infection of the whole of her brood, 

 which during the first weeks she is habitually covering with 

 her body. From this it follows that the means to be adopted 

 in order to exclude the disease from the pheasants at the 

 outset are very simple, viz., carefully select the hens for 

 rearing. They must be thoroughly examined before the 

 hatching of the pheasants commences. The mouth and 

 throat particularly, the skin of the abdomen and chest, must 

 be healthy; where there is a sign of cutaneous necrotic 

 disease, easily distinguishable as thick, dry, greyish-yellow, 

 friable deposits, the hen must be rejected. I know from 

 inquiry that nothing in the shape of a careful selection 

 actually occurs. Keepers take the hens wherever they can 

 get them ; they borrow them, buy them anywhere, or breed 

 them. Sometimes they have the disease amongst their own 



