173 





(a) of 139 cases : 



(b) of 38 cases : 



(c)o 



f 507 cases : 



Average of 3 

 observations : 



Age : 



Total 

 cases. 



Aver- 

 age for 



eaeh 



age. 



/•a 



lotal 

 cases. 



Aver- 

 age for 

 each 

 age. 





Total 

 cases. 



Aver- 

 age for 

 each 

 age. 





Aver- 

 age for 

 each 

 age. 



Aver- 

 age. 



% 



1—2 



5- 



2-5 



1.8 















4- 



2.0 



0.4 



2.3 



I.O 



3-4 



12. 



6.0 



4-3 



19. 



9-5 



25.0 



189. 



94-5 



18.0 



36.6 



16.0 



5—° 



15- 



7-5 



5-4 





S-o 



131 



91. 



45 5 



0.0 





s 



7-8 



18. 



9.0 



6.5 



4. 



2.0 



5-3 



88. 



44.0 



8.4 



18.3 



8.0 



9 — lo 



17- 



8.5 



6.1 



3- 



i-S 



3-9 



69. 



34-5 



6.6 



14.8 



6.5 



II— IS 



36. 



7.2 



5-2 



0. 







43- 



8.6 



1.6 



5-3 



2.3 



over 1 6 



26. 



2.6 



1.9 



2. 



0.6 



1.6 



25- 



2.0 



0.4 



1-7 



0.7 



Total 



139- 







38. 







507- 











Under 

 I year 



2. 





1-4% 



















Thus most cases occur in the 3rd and 4th years of age. We 

 must, liowevcr, remember that the average standard of the age 

 of a horse varies in different districts. So, in breeding and raising 

 districts, Miyagi for instance, younger horses predominate, 

 while in tliose places, where horses are kept for service, there 

 are more older ones ; and thus, for exact statement, allowance 

 must be made for these differences. Praedisposition seems 

 greater in weaker than in stronger individuals, in cold seasons 

 than in hot, chief!)' owing to the difference in hygiene. Whether 

 disposition disappears after one attack, as believed by quacks, is 

 questionable, and it requires further investigation."' 



The following circumstances may be enumerated as occa- 

 sional causes ; — i. Long persistent pressure, which causes con- 

 tusion and abrasion of skin, such as the pressure of saddle, har- 

 ness, &c. 2. All kinds of skin wounds especially at the inferior 

 part of the extremities. 3. Bad management especially of skin 

 and hoof During the winter season most farm horses have to 

 stay many weeks in a dusty stable with a dusty coat and depend 

 on a poor supply of winter rations. Here the resistence of the 



(I) PL'iich says, of iVfrican farcy, disposition diminishes after one attack, 



