TO FORM NEW BONE. 163 



EXPLANATION OF PLATE IX. 



Fig. I. Radius of a dog from which a piece of bone was taken along with the Periosteum. 

 Fig. II. Radius of the same dog, from which a similar piece of bone was taken without the Perios- 

 teum. 

 Fig. III. Longitudinal Section of the last mentioned bone, to shew the solidity of the newly formed 



portion. 

 Fig. IV. Portion of bone which was removed in this experiment. 



