Symptoms and Diagnosis of Chronio Roaring. 71 



than forced expiration. This fact appears to have been 

 known to Professor Coleman, of the Royal Veterinary 

 College, early in this century, as Mr. Percivall has heard him 

 say, in his lectures, " that Roarers are generally sound- 

 winded horses, as far as regards the healthy state of their 

 lungs."! The cough attending the latter condition is also 

 very different to that of Roaring, and the respiratory move- 

 ments continue abnormal when the horse is perfectly tranquil. 



^ " Lectures on the Veterinary Art," part ii., p. 256. 



