. The Dental cosmos. al impression is taken. This im-pression is easy to separate from the cast,as the places where teeth are left are markedby the projecting plaster. These teeth canbe further safeguarded against breaking byinserting before pouring the cast, little match-sticks into the depressions left by the re-maining teeth. An enlarged modeling com-pound impression is of great service also inedentulous cases, especially if a high palateis present. In taking an impression of afew teeth in crown- and bridge-work, it isvery practical to take a preliminary model-ing compound impression, which
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. The Dental cosmos. al impression is taken. This im-pression is easy to separate from the cast, as the places where teeth are left are markedby the projecting plaster. These teeth canbe further safeguarded against breaking byinserting before pouring the cast, little match-sticks into the depressions left by the re-maining teeth. An enlarged modeling com-pound impression is of great service also inedentulous cases, especially if a high palateis present. In taking an impression of afew teeth in crown- and bridge-work, it isvery practical to take a preliminary model-ing compound impression, which, after havingbeen suitably widened, takes the place of apartial impression tray.—Zahnarztliche Or-thopadie und Prothese. Combination Laboratory Seat.—A mostpractical and satisfactory way of using astool in the laboratory is shown in the ac-companying illustration. The attachmentshown converts the stool, the seat of which istoo low except for bench work, into a comfort-able and neat seat for working at the lathe.. A plate with a set-screw is mounted underthe center of the stool seat, through whicha hole is bored for the seat-post. Two piecesof iron pipe, an elbow, and an old bicyclesaddle constitute the remaining parts of thedevice. Provision is made for adjustment asto height, and the position of the saddle maybe changed in the ordinary way by using awrench on the part which grips the horizontallength of pipe, in the same way as the seaton a bicycle seat-post is adjusted.—PopularMechanics. PERISCOPE. 885 Convenient Preparation of Tincture ofIodin.—One week after preparation ordinary-tincture of iodin becomes an irritant; onemonth after, a caustic. Tincture of iodinwhich has thus become altered by the for-mation of hydriodic acid may destroy theepidermis and open the way to infection.To overcome this drawback, the addition of35 gram iodid has been proposed. Thus iodized, the tincture becomes inalterable. The prepar-ation of tincture of iodin according to theFormulary req