70 BOARD OF AGRICULTURE. 



Basing our calculations on these tables, presuming that seven 

 out of the thirteen animals, now owned by Mr. Chenery, are 

 diseased, and we have out of the 67 head in this herd, never 

 diseased or entirely recovered, 16 ; diseased, 51. 



Of the following herds known to be diseased, we have : — 



Mr. Chenery's herd, . . . .67 head — Died, 27 



Leonard Stoddard's herd, ... 48 " " 13 



Alden Olmstead's herd, . . .23 " " 7 



C. P. Huntington's herd, ... 22 " " 8 



A. A. Needham's herd, ... 22 " " 8 



Alden B. Woodis's herd, ... 21 " " 4 



203 head— Died, 57 



A trifle short of thirty per cent., and it is to be presumed that 

 as great a per «ent. would have died in the others as in Mr. 

 Chenery's herd, had they been left unslaughtered. These 

 herds constitute, it is believed, all, where any deaths have 

 occurred from this disease, except perhaps in one or two isolated 

 cases. There are the herds of Silas H. Bigelow, Lewis E. Ilill, 

 and D. W. Hooker, that probably had the disease ; but it is not 

 very well described. The herds of James Hunter, Roland F. 

 Doane, James C. Ayres, and B. W. Deane were sufficiently well 

 described to render them strongly suspected. Tliese suspected 

 herds were exposed later in the season than those where 

 animals have died. 



CONTAGION. 



We shall divide pleuro-pneumonia into three kinds — sporadic, 

 epizootic, and contagious. 



A sporadic disease is one in which the cases are siiigle or 

 scattered. An epizootic disease is one which seizes upon a 

 great number of animals at the same time, or in the same 

 season, owing to some external influence, which we cannot 

 understand. 



A contagious disease is one which may be communicated by 

 one animal to another, and we shall use the term in its broadest 

 sense, without attempting to make any distinction between 

 contagious and infectious. 



