{18 APPENDIX. — PLEURO-PNEUMONIA. 



inoculation — some contending that it will produce the 

 identical disease, and infect the animal as injuriously as 

 if taken from the breath of a diseased animal, and others 

 maintaining that the preponderance of the testimony is 

 strongly in its favor. The reports of experiments of the 

 Dutch, Belgian, and other commissions appointed to in- 

 vestigate this particular point, are not very conclusive, 

 though the results of the most extensive series of exper- 

 iments appear very strongly to favor it. 



Prof. Symonds, however, came to an opposite conclu- 

 sion, after a careful study of the cases that came under his 

 observation. 



The causes which predispose an animal or herd to the 

 attacks of this disease, Collot remarks, are continued and 

 intense cold weather, thick, damp, cold fogs, and exhala- 

 tions from woods and wet places, strong currents of air 

 in spring and autumn, abrupt variations of temperature, 

 exposure to rains, severe frosts, snows and storms, bad 

 and cold, stagnant water from melted snow and ice, 

 drunk while the animal is warm ; low, close, too warm and 

 badly ventilated stables ; a feeding and management with- 

 out change, and carried to extreme for the production of 

 milk or labor, or insufficient nourishment followed by over- 

 feeding, or want of regularity. Barns where the infec- 

 tion is known to exist ought to be cleansed in the most 

 thorough manner, by removing all the manure, by wash- 

 ing with water, chloride of lime, &c, and then white- 

 washing, and complete and long-continued ventilation for 

 two or three months at least before it is safe to introduce 

 healthy animals into them. 



It may be proper to remark that the Dutch cattle, which 

 seem to have been the means of introducing the disease, 

 have suffered less severely from it than others, and the 

 short-horns more. The Dutch is properly regarded as one 

 of the best dairy breeds in the world ; and the fact that 

 the disease happened to arrive with it should not preju- 

 dice the mind against it. 



