The laws and mechanics of circulation, with the principle involved in animal movement . n the Lungs.—Nota-bly, a large, lean dog (hound) was firmly held in the stand-ing position by several assistants, and, electing the interspacebetween the sixth and seventh ribs, a short silver tube, bent atright angles (Fig. 33), was passed into the pleural cavities—one upon either side at the most external portion of the were one-fourth inch in calibre and one and three-quar-ter inches in length, with a flange and openings for securing LUNG-ACTION DEMONSTRATED. 109 them to the sides of the wound
The laws and mechanics of circulation, with the principle involved in animal movement . n the Lungs.—Nota-bly, a large, lean dog (hound) was firmly held in the stand-ing position by several assistants, and, electing the interspacebetween the sixth and seventh ribs, a short silver tube, bent atright angles (Fig. 33), was passed into the pleural cavities—one upon either side at the most external portion of the were one-fourth inch in calibre and one and three-quar-ter inches in length, with a flange and openings for securing LUNG-ACTION DEMONSTRATED. 109 them to the sides of the wounds ; while they were bent to de-flect them away from the lungs, at the same time it made itmore difficult for the animal to extricate them. The imme-diate effects of the operation not a little surprised me, thoughI had previously discounted them. In place of at once falling down in a state of asphyxia, theanimal continued in the standing position, but taking longand deep inspirations, swelling himself out to a prodigioussize, then as slowly contracting the chest again; doing this. Pig. 33.—Tracheal System and Terminal Air-Ceils, in diagram.—Dalton. from seven to eight times per minute, the whole performancebearing a very striking resemblance to what takes place aftersection of the pneumogastric nerves. But when liberated, heran round and round the room as though seeking for meansof escape, frequently stopping suddenly upon the haunchesto bite at the tubes, first at one side, then at the other, evi-dently in much misery; then as suddenly starting up againto take a run of the room, but never going far, however, with- 110 LUNG-ACTION DEMONSTRATED. out making one of these halts for relieving himself of theinstruments. I had been watching him thus for over twentyminutes, when I was called away upon urgent business, myfriends going with me, and when I returned, which was fullythree hours later, being unavoidably detained, I found thepoor fellow unconscious, lying at full lengt
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