Interior Arrangement of Lungs. — On turning this flap over we find a vertical section of lungs, showing their anterior arrangements. The lower end of the trachea divides, one portion going to each long. These again subdividing continue to subdivide in geometrical order, growing smaller and smaller with each division, and extending [...]

The Collar Bone.  — The collar bone is fast and that one into the breast bone in the first drip, and at the other into a shoulder blade.  It does holes the shoulder-joint out from the chest, eight in protecting the important vessels of the axilla, and gives the arm a greater range of freedom, [...]