RESPIRATION 



479 



passive movement easily obstructed, and of the breathing of lizards 

 generally. 



Expt. 33. Apnea. (Apparatus: Anolis stethograph and kymograph.) 

 Place the animal as in the last experiment and make a normal pneumo- 



FIG. 266 



The Anolis stethogram. This shows the inspiratory apnea (so marked a characteristic in the 

 respiration of many lizards) occurring during rapid rhythmic breathing. To be read from right 

 to left. Original size. The time-line is in seconds. (April, 1900.) 



gram. Stimulate him by tapping his nose very gently with a straw. 

 He will stop breathing for a time and after a full inspiration. Note 

 the number of breaths covered by this pause and the increased depth 

 and frequency of the respirations following it. 



FIG. 267 



The Anolis stethogram. This shows the strongly apneic type of the breathing of the southern 

 "chameleon." Observe that the inspiratory movements are never interrupted. To be read from 

 right to left. Reduced. The time-line is in seconds. 



Expt. 34. Anesthesia. (Apparatus : Anolis stethograph, kymograph, 

 small wads of filter paper soaked in chloroform.) While the animal is 

 recording a normal pneumogram, place near its nostrils the wad of filter- 



