190 



We say " principally produces," for the active 

 working of the (left) anterior winding line against 

 the stationary position of the posterior end of the 

 S, has begun the lower part of the rear C, before 

 the active working of the posterior point begins, 

 and the virtual effect of the (right) posterior Hne 

 is similar at the front part of the front C. The 

 concavities, however, were much increased by the 

 pressure of the diagonal points of application. 



It is the extension of the (left) anterior concave 

 and its acceptance by the (left) posterior point of 

 pressure, and the extension of the (right) posterior 

 concave and its acceptance by the (riglit) anterior 

 point of pressure, which brings about the change 

 of curvatures, or for halting and setting up, the par- 

 tial change and consequent equalization. 



Ninth. — The filling of either upper or lower lung 

 lobe brings its C forward, when, of course, the 

 other C of the S passes relatively backwards. Thus, 

 when the upper lung lobes fill, the lower lung lobes, 

 and with them the hinder Hmbs, pass to the rear ; 

 when the lower lung lobes fill, the hinder limbs 

 come forward. 



Tenth. — The inner bearing of the propellers de- 

 veloped on the convexes includes the reactions of 

 an anterior windiag Hne and its diagonal posterior. 



