A more serious part of the secondary disease is affection of the deep-seated parts, ligaments, periosteum, and bones. The bones nearest the surface are principally affected: a swelling gradually forms on the tibia or ulna, without discoloration of the integuments, and without pain occurring till after a long time. The pain is most severe during the night. The inflammation of the periosteum is often very violent, the subjacent bone, as in the head or extremities, becomes dead, and exfoliates; but it remains to be seen whether this will take place when mercury is more sparingly, if at all, administered. Ulcers betwixt the toes, occurring along with the above symptoms, are supposed to be venereal: they are unseemly, and peculiarly fetid.[24] Such are the affections, local and constitutional, arising from a venereal cause; but the latter may be simulated. Many affections of the skin, mucous membranes, and bones, resembling the venereal disease, may be produced by disorder of the constitution, by a decay of the digestive organs, by unwholesome food, and exposure to inclement weather, by inattention to cleanliness, and many other circumstances. Morbid poisons, not venereal, but of various kinds, may exist, and cause much mischief. A disease resembling syphilis was produced by the cruel practice of transplanting teeth from sound people into the jaws of persons in the higher ranks of life, whose corresponding teeth were decayed. The latter were the affected party, and that justly.