550 
MR. SIRSON ON THE MECHANISM OF RESPIRATION. 
Fig’. XXV. The new-born infant (§ 98), are figures of the chest in pairs, illustrating 
the position of the ribs and the action of the intercostals in expiration and in in- 
spiration. 
Fig. VII. a.b. The Pig, 
Fig. VIII. a. b. The Sheep, 
Fig. X. a.b. The Ass, and 
Fig. XI. c.d.e.f. The Dog, are figures of the chest in pairs, illustrating the position 
of the ribs and the action of the intercostal muscles in expiration (the lungs being 
flaccid) and in inspiration (the lungs being distended) (§§ 31-49, 56-61). 
Fig. XXVI. Shows the blending of the transversales and sterno-costals in Man to 
form one muscle (^ 94). 
Fig. XXVI. a. The pleural scalenus (in Man) (§ 84) (fig. XIII. b. 1 a). 
