SECRETARY'S REPORT. 81 



that tlic evidence fails to convince us that these specimen 

 animals were diseased. If it be urged still further that fifty or 

 sixty animals surrounding Mr. Chenery's farm escaped, it must 

 be remembered that his cattle were usually kept isolated in the 

 barn, and when let out remained near it. His farm is on the 

 top of a high hill, over which a strong breeze usually sweeps, 

 and the farms surrounding are on a lower level. 



INCUBATION. 



Basing our calculations upon facts derived from herds where 



the disease undoubtedly existed, we arrive at the following 

 conclusions, in regard to the time of incubation : — 



W. W. Chenery's herd (Stoddard calf,) . . 29 days. 



Leonard Stoddard's herd, 28 " 



Alden Olmstcad's " 10 " 



A. A. Needham's " 27 " 



C. P. Huntington's " 36 " 



Alden B. Woodis' " 21 " 



Divided by ... . 6) 160 days. 



Average time of incubation in these six herds, 20f days. 



In the case of the Chenery calf, we have allowed the longest 

 possible time after exposure. And the same rule was adopted 

 in reference to the cases of Leonard Stoddard, A. A. Needham, 

 and Alden Olmstead. 



In the cases of C. P. Huntington and Alden B. Woodis, the 

 longest reasonable time after exposure was allowed. 



In the first four cases the time of incubation could not have 

 been over that stated ; in the two last it was reckoned from the 

 time when the new-coming animal began to show signs of 

 sickness. 



The Chenery Stoddard calf showed the first signs of sickness 

 29 days after the arrival of the Holland cows at the farm. 



Leonard Stoddard's first cow was attacked 28 days after the 

 introduction of the sick calf into his herd. 



Alden Olmstead's first case occurred 19 days after the 

 entrance of the sick oxen into his herd. 



A. A. Needham's first animal was taken sick in 27 days after 

 the sick Stoddard cow entered his herd. 



