BROKEN-WIND. 159 



Squeezed between the fingers, it crepitates, and emits upon 

 the surface numerous little globules of air. If attempts be 

 made to collect this air underneath the pleura, it escapes 

 into the interlobular cellular tissue, and becomes collected 

 into small bladders between the lobules. 



In the second kind of dilatation of the air-cells — that 

 which is local or partial — when in the anterior lobes they 

 present a sort of rumpled semi-inflated appearance, of a pale 

 rose colour, and consist interiorly of air-cells dilated to the size 

 of a pin^s head, or from that to a millet seed. Deep incision, 

 laying open a bronchial tube, collapses them ; but pricking 

 with a pin does not. Circular compression upon any part 

 effects perfect collapse, the air escaping into the bronchi. 

 The mediastinal lobe of the right lung, thus affected, pre- 

 sents similar characters ; but when the local dilatation 

 occupies the borders of the lungs, it shews itself in exten- 

 sive, not prominent, rose-coloured irregular eminences, and 

 the parts appear swollen, and inwardly display very dis- 

 tinctly the air-cells become enlarged and more transparent. 

 The lung pits from the pressure of the finger; and the 

 act of pression, dispelling the air, occasions slight crepita- 

 tion. Inflation of the entire lung causes the corrugations 

 and eminences to swell before the remaining sound portion 

 receives the air. 



In the third kind, or broad-cast air-cell dilatation, slight 

 elastic eminences are perceptible, paler in colour than the 

 sound parts, and varying in magnitude from a lentil-seed to 

 a hazel-nut or walnut. These eminences are spread about 

 upon the surfaces and borders of either one or both lungs. 

 Sometimes they are very numerous: Delafond has counted 

 as many as thirty-five upon the surface of both lungs. 

 Like the large corrugations, they collapse by incision; and 

 when the lung is gently inflated through the windpipe, they 

 swell and rise towards the surface before the surrounding 

 parts become inflated. The middle of the parenchyma is 

 not exempt from these alterations. To demonstrate this, 

 expose the whole lungs to the air for twenty-four or thirty- 

 six hours, and afterwards incise them in all directions. The 



