AVES.
The scope of the present work will allow only very brief treatment of this part of the subject.
Of or pertaining to Birds, Poultry, Etc.
The bone tissue or substance of birds are exceedingly compact and hard, white in color; and some of the bones are pneumatic, or contain air instead of marrow, notably these are bones of the skull, the sternum or breast bone, and the upper bones of the limbs. There are a great variety in the amount of pneumaticity or air possessed by the skeleton of different species, but it is not necessarily determined by the flying power of the animal.
CHAPTER II.
ARTHROLOGY.
What is known regarding the articulations of bones of joints. The several bones which form the skeleton are united by means of certain soft structures, forming a number of articulations or joints, the study of which is termed arthrology.
Before considering the different forms of joints, it will be advisable to describe briefly the various tissue, other than bone, which enter into and contributes towards their formation. These are chiefly cartilage, connective and elastic substance or tissues, and fat.