The Dental cosmos . mont State Board ofDental Examiners for the examination ofcandidates will be held at the State-house,Montpelier, Vt., Monday, Tuesday, and Wed-nesday, July 1, 2, and 3, 1907, commencing at2 oclock of July 1st. All applications, to-gether with the fee, $, must be in thehands of the secretary not later than June23d. Geo. F. Cheney, Secy,St. Johnsbury, Vt. DNITED STATES PATENTS PERTAINING OR APPLICABLE TO DENTISTRY ISSUED DURING MAY 1907. May 7. Xo. 852,413, to E. C. Bennett. Removabledental bridge work. May H. Xo. to F. Ritter. Dental 853,431, to A. B.
The Dental cosmos . mont State Board ofDental Examiners for the examination ofcandidates will be held at the State-house,Montpelier, Vt., Monday, Tuesday, and Wed-nesday, July 1, 2, and 3, 1907, commencing at2 oclock of July 1st. All applications, to-gether with the fee, $, must be in thehands of the secretary not later than June23d. Geo. F. Cheney, Secy,St. Johnsbury, Vt. DNITED STATES PATENTS PERTAINING OR APPLICABLE TO DENTISTRY ISSUED DURING MAY 1907. May 7. Xo. 852,413, to E. C. Bennett. Removabledental bridge work. May H. Xo. to F. Ritter. Dental 853,431, to A. B. Allen. 853,439, to A. C. Clark. Inhaler. May 21. Xo. , to C. F. Lauderdale. Tooth-crown model. Xo. 854,283. to J. M. Evey. Dental root-im-pression and crown-mounting instru-ment. No. 854,486, to J. F. Gibson. Display car-rier for artificial teeth. May 28. Xo. , to J. Ramsperger. Artificialtooth. No. 854,898, to H. Lorexz. , to F. W. Dean. Handpiece fordental DR. JOHN I. HART. THE Dental Cosmos. Vol. XLIX. AUGUST 1907. No. 8. Original communications. DR. MILLERS OBSERVATIONS ON THE WASTING OF TOOTHTISSUE, VARIOUSLY DESIGNATED AS EROSION, ETC., VIEWEDIN THEIR RELATION TO THE POWER POSSESSED BY SALIVAOP CONTROLLING ACID DECALCIFICATION. By JOSEPH HEAD, , , Philadelphia, Pa. AS one who has been experimentingfor the last four years on the sub-ject of enamel erosion and abrasion,I should like to offer a few criticisms onDr. Millers detailed and suggestivework. In the Cosmos for April 1907, , I asked why Dr. Miller relies uponthe litmus paper test to determine thealkalinity, neutrality, or acidity of thesaliva, when the same saliva will fre-quently turn blue litmus red, and redlitmus blue; while Sutton, the greatauthority on acidimetry, says that a sa-liva which is neutral to litmus may beacid to turmeric paper and alkaline tolacmoid or Congo red?* In the JulyCosmos, page 677, Dr. Miller in answersays: I hav
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