3o8 



PRACTICAL PHYSIOLOQY. 



[LXV. 



PHYSIOLOGY OF RESPIRATIOW. 



LESSON LXV. 



MOVEMENTS OP THE CHEST WALL — ELAS- 

 TICITY OP LUNGS— HYDROSTATIC TEST. 



1. Movements of the Chest Walls — Stethograph. 



A Rabbit. — (a.) Arrange a drum and time-marker. Fix a rabbit 

 conveniently, e.g., on Czermak's rabbit-holder, or use the simpler 

 form of Malaysez or Steinach, and with tapes tie on its chest Marey's 

 double tambour (fig. 231), connecting the latter with a recording 



FWb a3i. — Marey's Double Tambour, to be tied round the chest of a rabbit. 



tambour adjusted to write on the drum. Introduce between the 

 receiving and recording tambours either the valve usually suppUed 

 with Marey's apparatus or a T-tube vdth. a screw clamp, whereby 

 the pressure within the system of tubes can be regulated. Take 

 a tracing. If one of the receiving tambours be placed over the 



