The opinion, that the use of tobacco preserves the teeth, is supported neither by physiology nor observation. Constantly applied to the interior of the mouth, whether in the form of cud or of smoke, this narcotic must tend to enfeeble the gums, and the membrane covering the necks and roots of the teeth, and, in this way, must rather accelerate than retard their decay. We accordingly find, that tobacco consumers are not favored with better teeth than others; and, on the average, they exhibit these organs in a less perfect state of preservation. Sailors make a free use of tobacco and they have bad teeth. The grinding surfaces of the teeth are, on the average, more rapidly worn down or absorbed, from the chewing or smoking of tobacco for a series of years; being observed in some instances to project but a little way beyond the gums. This fact I have observed, in the mouths of some scores of individuals in our own communities, and I have also observed the same thing in the teeth of several men, belonging to the Seneca and St. Francois tribes of Indians, who, like most of the other North American tribes, are much addicted to the use of this narcotic. In several instances, when the front teeth of the two jaws have been shut close, the surfaces of the grinders, in the upper and lower jaw, especially where the cud had been kept, did not touch each other, but exhibited a space between them of one-tenth to one-sixth of an inch, showing distinctly the effects of the tobacco, more particularly striking upon those parts, to which it had been applied in its most concentrated state. The expensiveness of the habit of using tobacco is no small objection to it. Let the smoker estimate the expense of thirty years' use of cigars, on the principle of annual interest, which is the proper method, and he might be startled at the amount. Six cents a day, according to the Rev. Mr. Fowler's calculation, would amount to $3,529 30 cents; a sum which would be very useful to the family of many a tobacco consumer when his faculties of providing for them have failed.