From the fact that there are so many different accounts given of the ossification of the lower jaw, it is evident that the question is in need of reinvestigation. Nothing more recent than Bland-Sutton's account seems to have been published on the subject, and that is based on work apparently done in 18831 and, as will be seen, it can be by no means considered conclusive.
It is necessary to state the various accounts as the recognized text-books give them in order to appreciate the great diversity of opinion which exists.
If we begin with Quain, we find, the following statement:
The largest part of each half is formed from a deposit (dentary) in the membrane on the outer side of Meckel's cartilage, and to this there is added a second smaller plate (splenial) which forms the inner walls of the tooth sockets, terminating behind in the lingula. A small