376 ANIMAL MECHANICS 



Abduction Muscles of Lions Hip — Position of Rotation axes. 





Angle made 



Muscle. 



with long axis 





of pelvis. 



1. Agitator eaudse, . 



2. Obturator interims, . 



3. Glutaeus secundus (a), 



4. Glutaeus primus, . 



5. Glutaeus quartus, 



6. Glutaeus tertius, . 



7 . Tensor vaginae femoris, 



8. Glutaeus secundus (/3), 



- 15 45 

 o 00 

 + 12 00 

 + 27 30 

 + 39 20 

 + 45 °5 

 + 48 15 

 + 54 00 



Muscles used in Adduction. — In discussing the muscles 

 used in abduction, we have gone half way round the hip 

 joint ; in the muscles used in adduction, we shall complete 

 the remaining half of the circle, in the reverse order, as shown 

 in the Table of muscles (p. 362). 



1. Adductor primus. — This muscle takes its origin from 

 a surface 2.61 inches in length, extending nearly from the 

 tuber iscliii to the posterior end of the symphysis pubis ; and it 

 is inserted for a length of 4.40 inches into the far end of the 

 linea aspera. It forms a skew muscle, although not so 

 markedly as the other adductors ; and we shall investigate the 

 conditions of its maximum work, by the method laid down for 

 skew muscles. 



Lion — Adductor primus. 



Lengths of extreme Lengths of Origin and 



Fibres. Insertion. 



p = 8.00 in. a = 2 61 in. 



Pi = 1 1 60 a' = 4.40 



Constants of Hyperboloid. 



