OBSERVATIONS ON THE OA N NET. l8j 



through a pipe introduced at that part, (the pipe 

 in the trachea having been previously stopped), 

 and a similar inflation ensued without affecting 

 the exterior cells. The pipe was now removed 

 from the trachea, and, upon the air being propel- 

 led with force through the pipe at the vent, it 

 readily found its way through the larynx, produ- 

 cing a noise similar to the sound emitted by the 

 living bird. A small opening was then made in 

 the skin on the left side, about mid-way between 

 the wing and the thigh, and a pipe introduced, 

 having first stopped those directly communicating 

 with the internal parts, it was obvious, that 

 when air was forced through this orifice, the skin 

 on that side, as far as the middle line of the body, 

 was greatly inflated, and it extended into the lower 

 part of the neck, along the larger joints of the 

 wing, down the thigh, and also into the cavity 

 of the body, but the right side was not in the 

 least affected : the pipe at the trachea being re- 

 moved, the air produced a similar effect upon the 

 larynx as before mentioned, but not so loud. Still 

 suspecting there was a communication between 

 the sides, by means of some valvular apparatus, 

 the right side was subjected to the same experi- 

 ment j but the result negatived my expectation, 

 the effect produced being similar in every re- 

 spect. 



From a repetition of these experiments upon 

 several subjects, it became evident, that there 



m 3 



