54 THE PRINXIPLES OF MYODYNAMICS. 



weight the following conclusions may be drawn : 



(i.) In a bony lever of the I order: — The 

 moving component of the power plus the resist- 

 ing component of the weight equals the pressure 

 of these components on the fixed bone. 



(2.) In a bony lever of the II order: — The 

 resisting component of the weight minus the 

 77ioving component of the power equals the 

 pressure of the components on the fulcrum. 



(3.) In a bony lever of the III order: — The 

 moving component of the power mi 71 us the i^e- 

 sisti7ig component of the weight equals the 

 pressure of these components on the fixed bone. 



(4.) The sum of the components acting at 

 right angles to the ends of the bony lever equals 

 the resulta7it component acting in the continuity 

 of the lever. 



(5.) The movi7ig a7id resisti7ig compo7ie7its are 

 C07ise7'vative. 



(d) In regard to the displaci7ig components of 

 the power and the weight the following conclu- 

 sions may be drawn : 



(i.) In a bony lever of the I order: — i. Begin 

 with an acute myodynamic angle, when the dy- 



