We have ventured to bring our examination of this specimen under the notice of the Society, not so much for its pathological interest, as for the light which it throws upon the normal mode of growth of the skeleton. There has been a tendency of late to regard endochondral ossification as quite secondary in importance to that of membranous ossification, but we believe that the case illustrates in a very striking manner the important part played by ossification in cartilage in the growth of the greater part of the skeleton.