A method of casting a plaster model where you take a bite and desire to get a model very quickly: First, cast one side, turn the impression over, place a double piece of bibulous paper over the plaster that is to form the tail piece and cast the other side. It comes apart without any trouble, doing away with shellac and oil, and is done with one mix of plaster. DR. CLAPP:—A bit of vaseline will accomplish the same thing. DR. COOKE:—I have never tried the vaseline. I have a rather interesting case, an extensive piece of bridge and crown work which the patient received some years ago from a firm who make a specialty of this work. The bridge on the right side had broken away, several abscesses had formed, and the condition of the mouth was far from satisfactory. DR. SMITH:—Mr. President, right here, after Dr. Cooke's remarks in presenting this case of bridge-work, and knowing that he himself has performed some operations in bridge-work, I would like to ask if the result of his experience places him on record as universally condemning bridge-work. DR. COOKE:—Far from it. I simply presented that as a specimen of bridge-work as performed in the nineteenth century. It was done by a firm that makes bridge-work a specialty. DR. MERIAM:—These instruments, I think, have never been made in America. I had them copied by Mr. Schmidt. I present first the set of groove cutters or chisels for molars and bicuspids. I think you will find them about page 122, Appendix to Ash's Catalogue, 1886. They are of the well-known chisel form, and I will send around with them two made on my own curve. I like the Whitten Approximal Trimmers very much as a trimmer and also as a scaler, but I wanted something with a little suggestion of Dr. Lord's added to Dr. Whitten's, and in these the blade is flat and passes easily between the teeth. While I am on the subject, I will show some of Dr. Lord's excavators that I have had made quite small, smaller than he has made himself, and for a simple proximal cavity where only one instrument is to be used, I think they are admirable. Dr. Lord only orders them in hatchet forms. Here are some hoes that I directed Mr. Schmidt to make for me; some of them have been rubbed down thinner. H. L. UPHAM, D.M.D., _Editor Harvard Odontological Society_. * * * * * Send subscriptions to the ARCHIVES to Dr. DeCoursey Lindsley, 321 N. Grand Avenue, St. Louis, Mo. DISCUSSION OF DR. PARR'S PAPER: IMMEDIATE SEPARATION OF THE TEETH.[5]