S6 COMPENDIUM OF THE VETERINARY ART. 



difficult, as the return of the ribs and dia- 

 phragm naturally force it out by their pressure; 

 Thus in broken winded horses inspiration is 

 v^iy slow, but expiration is sudden and rapid, 

 as may be seen by the flanks returning with a 

 jerk." 



It appears to me that the observations of 

 Mr. Lawrence on this subject are not correct. 

 The luno-s of broken winded horses that 1 have 

 examined have generally been unusually large, 

 with numerous air-bladders on the surface. 

 Tiiis must have ansen from a rupture of some 

 of the air-cells ; for in tiiis case some part of 

 the air which is inspired will necessarily get 

 into the cellular membrane of the lunors, and 

 diifuse itself until it arrives at the surface, 

 when it v\ill raise the pleura so as to form tiie 

 air-bladders we observe*. This is the reason 

 that the lungs of broken winded horses do 

 not collapse \a hen the chest is pinictured ; and 

 this will serve to explain the peculiar motion 

 of the flanks m broken wmded horses, v\hich 

 does not consist, as Mr. Lawrence asserts, in a 

 quick expiration and very slow inspiration, but 

 quite the reverse; air is received into the 



* See Dcicriptiouof the Functions of the Lungs, &c, asaboFC/ 

 page 4. 



