LIST OF ILLUSTRATIONS 



1. A Human Skeleton in the Attitude of a Quadruped, 



To GIVE A General Idea of the Position of the Bones 



IN OTHER Vertebrates - - - - - 5 



2. Size of the Atlas compared with the Transverse 



Dimensions of the Corresponding Parts of the 

 Skull in Man ------ 7 



3. Size of the Atlas compared with the Transverse 



Dimensions of the Corresponding Regions of the 

 Skull in a Dog - - - - - 8 



4. Lumbar Vertebra of a Quadruped (the Horse) : 



Superior Surface - - - - - 9 



5. A Transverse Section of the Thorax of a Man placed 



Vertically — that is to say, in the Direction which 

 it would assume in a Man placed in the Attitude 

 OF A Quadruped (a Diagrammatic Figure) - - 13 



6. A Vertical Section of the Thorax of a Quadruped 



(Diagrammatic) - - - - - - 14 



7. Sternum of a Bird (the Cock) : Left Side, External 



Surface - - - - - - -17 



8. Anterior Limb of the Bat ; Left Side, Anterior 



Surface -- - - - - -20 



9. Anterior Limb of the Seal : Left Side, External 



Surface - - - - - - - 21 



10. Situation and Direction of the Scapula in the 



Human Being, the Trunk being Horizontal, as in 

 Quadrupeds. Vertical and Transverse Section 

 of the Thorax (Diagrammatic Figure) - - 22 



11. Position and Direction of the Scapula in Quadru- 



peds. Vertical and Transverse Section of the 

 Thorax (Diagrammatic Figure) - - - 22 



12. Left Scapula of the Human Being, Posterior Surface, 



placed in the Position which it would Occupy in 



THE Skeleton of a Quadruped - - - 23 



13. Left Scapula of a Horse : External Surface - 23 



XV 



