1884.] 



Origin of the Respiratory Sounds. 



413 



The lower tap being shut, and water poured into the chamber till 

 it was nearly full, the artificial chest was ready to receive the lungs. 



The righb lungs of calves and sheep have a small supernumerary 

 bronchus arising from the trachea about 2 inches above its bifurcation. 

 The left lung was therefore always chosen to be placed in the chamber, 

 and this was accomplished by passing the lung between the two parts 

 of the sliding frame shown in fig. 3, and then bringing the parts 



Fig. 3. 



together, so that the left bronchus passed without pressure through 

 the hole formed by the two notches in the sides of the frame at N. 

 One lung was then above and the other below the frame, as shown in 

 profile in fig. 4. 



Fig. 4. 



The inner end of the stethoscope L was attached to the lower Jung 

 by tying it to the fold of pleura running down the back of the lung, 

 and the lung and stethoscope were passed into the chamber through 

 the hole in its roof. 



2 E 2 



