The grand distinction between mind and matter may be seen thus: If we give any physical object to another, we part with it, but if we give a new idea on any subject, we do not part with it, but in so doing its boundaries are enlarged in our minds. The space occupied in briefly presenting my views on the subject I have chosen is greater than I at first intended, but the fundamental principles which underlie everything with which we have to do, and the importance of fully understanding them, is my only apology for occupying so much of your time.--_Dental Luminary._ ARTICLE II. PULPLESS TEETH. BY DR. WILSON, OF BURLINGTON, MEMBER OF THE FACULTY OF THE DENTAL DEPARTMENT OF THE STATE UNIVERSITY. [Extracts of a paper read before the Iowa Dental Association at its late annual meeting.] A pulpless tooth is not necessarily a dead tooth, but a dead tooth is, of course, a pulpless tooth. The adjectives "pulpless" and "dead" are not, therefore, synonymous, although frequently so used, especially by medical writers. Let us note the marked distinction between the two. A pulpless tooth may be a part of the living organism--a dead tooth has its nutritive supply entirely cut off, and it is in every sense a foreign body--it is dead and inert. The former may be restored to health and usefulness--the latter should always be condemned as a nuisance that cannot be abated without the use of the forceps. * * * * Having thus briefly called attention to the fact that the dentine and cementine derive their vitality from independent sources--that the life of the one is not dependent upon the life of the other--that a pulpless tooth is not necessarily a dead tooth--we are prepared to consider, understandingly, the subject of this paper. It may, however, seem like presumption on the part of the writer, in thus offering the foregoing to an intelligent body of dentists, when every student of dentistry at the close of his junior year should fully understand the facts above stated. But I am led to a consideration of this subject from articles entitled, "Dead Teeth in the Jaws," that have appeared, from time to time, during the last two years, in the New York _Medical Record_, and as those articles come from high sources in the medical profession, they deserve more than passing notice. The able editor of that journal, and Dr. Samuel Sexton, a distinguished oculist and aurist of New York City, being the principal writers referred to. The _Medical Record_ of October 4, 1884, contains a report from the aural service of Dr. Sexton, entitled, "Pain in the Ears due to Irritation in the Jaws." He describes a number of cases of otalgia in which he found the lesion to be in diseased teeth.