386 ANIMAL MECHANICS. 



Hence we find 



0 = 45° 45', 



Work done 



sin 2O =? ^ — ; r = 99.96 per cent. 



Maximum work " * 1 



Collecting the preceding results into one Table, we find — 



Adduction Muscles of Lions Hip — Difference h&tween Theory 

 and Observation. 



Muscle. 



Work done. 



Difference between 

 work done and 

 maximum work. 



1. Adductor primus, 



2. Adductor secundus (a), . 



3. Adductor secundus (/3), . 



4. Adductor tertius, 



5. Adductor quartus, 



6. Adductor quintus, 



7. Obturator externus, . 



97.70 per cent. 

 98.88 „ 

 97.92 



98.63 „ 



98.63 



99.96 



2. 30 per cent. 

 1. 12 



2.08 „ 



'•37 „ 



1-37 



0.04 



Mean, . . . 98-62 per cent. 



1-38 per cent. 



Nothing can be more complete than the proof afforded by 

 the foregoing Table, that the adduction muscles, like the 

 abduction muscles, are all placed in reference to the socket 

 of the hip joint, in such a manner as to produce the maximum 

 amount of work. 



It is unnecessary to discuss the case of the flexion and 

 extension muscles, for, in p. 258, et seq., I have fully proved 

 that they are placed (not merely in relation to the hip joint, 

 but also in relation to the knee and heel) so as to produce the 

 maximum of work possible. 



It would be tedious to make similar calculations for the 

 muscles of other animals ; and it is sufficient to state that I 

 have completed many such calculations, for the hip, shoulder, 



