Several of the growths adverted to as deviating in certain points from standard bone-texture, might be transferred to this section. To it, however, belong more especially ossifications of costal cartilages, and most of all ossifying enchondromata, both in bones, and in soft parts. In bone there occur independent texture-supplanting tumors, which consist of an ivory-like, dense, white bone-substance, and which are seen both in this, and in their general character to be ossified enchondromata.

Muller's osteoid is a bone-formation which enters redundantly into the parenchyma of cancer. Its constitution is identical with that of true bone, and it will be discussed under the head of Cancers.