141 



LECTURE VIII. 



Of Bone — Organic and Inorganic Matter of Bone — 

 Formation of Organic Matter — Cancellated Texture and 

 Comjpact Tissue — Living Bone and dead dried Bone — 

 An elementary part of Bone — Living Bioplasm of Bone 

 — LacuncB and Canalicidi — Lamellce — Perforating 

 Fibres — Periosteum and Medullary Memhrane — Forma- 

 tion of Osseous Tissue — Bioplasm of the Lchcunce — The 

 views of KolliJcer and Virchoiv — Changes beneath Peri- 

 osteum and Medullary Membrane — Medulla or Marrotv 

 — Marroio Cells — Changes occurring in an Saversian 

 System of fidly formed Bone — Of the disintegration 

 and removal of Bone — Formation of primary Bone — 

 Repair of Bone — Liflammation of Bone — Caries and 

 Necrosis. 



One of tlie most interesting structures in the body 

 as regards the process of tissue- formation is bone. 

 By studying this texture at different periods of its 

 development we may determine what part of the 

 process is due to physical and chemical changes, 

 and what to exclusively vital actions. 



197. Organic and inorganic matter of bone. — It is 

 important to bear in mind that every kind of bone in 

 its lifeless state consists of an organic substance which 

 yields gelatin by boiling, and inorganic salts composed 

 principally of earthy phosphates. The organic and 

 inorganic matter, although intimately incorporated, 

 may be separated by the action of hydrochloric acid, 

 which dissolves the earthy and leaves the animal 

 matter. This exactly corresponds in form and size 

 to the original bone. If, on the other hand, the 

 animal matter be destroyed by a red heat, the earthy 

 material will also retain the original form of the bone, 



