Marrow Bones

Author: Top of the Rock Astronaut / Labels:

Bones are formed of a dense cellular tissue of membranous matter, made stiff and rigid by insoluble earthy salts; of which, phosphate of lime is the most abundant. In a large bone, the insoluble matter is generally deposited in such a manner as to leave a cavity, into which a fatty substance, distinguished by the name of marrow, is thrown. Hollow cylindrical bones possess the qualities of strength and lightness in a remarkable degree. If bones were entirely solid, they would be unnecessarily heavy; and if their materials were brought into smaller compass, they would be weaker, because the strength of a bone is in proportion to the distance at which its fibres are from the centre. Some animals, it must, however, be observed, have no cavities in the centre of their bones; such as the whale tribe, skate, and turtles.

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