a lift; but you cannot find another chair with all these advantages combined with as low a price. Some Improvements MPORTANT improvements in the plush and L'and corded upholstery styles of this chair and materially to its beauty. The arm blocks are now flat, like those of the Wilkerson, and are made in dark woods. The plush upholstered chair especially affords the opportunity, where economy of first cost is essential, to fit the office with a tasteful, inviting chair, which will give the patient ease and the operator satisfaction in its use, at an extremely low price. The Nature of the Lift .... A S is indicated by the name the lift is of a dual character. There is a pedal lift of ten inches, and an additional hand-lift or seat adjustment of twelve inches. The seat of the chair has thus an upward range of 22 inches from its lowest position at 18 inches from the floor. Here is a range which will meet the needs of the shortest or the tallest operator. And that was exactly the object in building the chair on the duplex lift plan. No one dentist has occasion to use so great a range; but some men are tall. others are short, others of middle size. This chair is built with a double-lift, so that with one set of patterns we can meet the needs of all, and so keep the price dowa. The Way the Lift Works .. VERY dentist wants, for convenient and easy access the cavity he works upon at a certain height from the floor, that height varying with his height, and, to some extent, with personal peculiarities. But every man knows what that elevation is for himself. So. whether he is tall or short, when he gets a Duplex Lift Chair, he raises it by means of the hand-shift, until the seat is at the lowest point at which he can operate conveniently. That is done, once for all. He then has the 10 inches additional rise of the pedal lift with which to adjust the height to suit cavities in differeut portions of the mouth The lowering lever pplies only to the pedal-lift; so that the chair never goes below the point fixed by the hand-lift In fact, after the hand-lift is once adjusted, it is rarely necessary to disturb it, never with a patient in the chair. The notches in the hand adjustment are 11⁄2 inches apart, and there are eight of them The dentist of average height will probably find that with the chair raised to the second or third notch his couvenience will be suited A very tall dentist will raise the seat higher. At whatever height it is set, the chair is always firm and solid. Other ..... HE head-rest is one of the features of this chair. Empty, it will rock like a hammock; with a patient's head upon it, it is immovable. At the other end of the chair, the footrest has an up and down adjustment of 8 inches, within which it is firmly held at intervals of 11⁄2 inches. The chair has an easy tilt, and the back may be lowered until the patient, as for the administration of an anesthetic, can be placed in a nearly horizontal position. There is one other advantage which this chair possesses. It bears the trade-S.S. W mark, which makes good and perpetuates its mechanical advantages, giving it perfection of etion and durability In Maroon Plush Upholstery. with Flat Arins $85 00 80 00 BOXING, FREE. The S. S. WHITE DENTAL MFG. CO., Philadelphia, New York, Boston, Chicago, Brooklyn, Atlanta, Rochester, Published bi-monthly throughout the college year, the first number appearing in January, The subscription price is fifty cents per year, or three years for $1.00. All communications should be addressed to The DENTAL JOURNAL, Ann Arbor, Mich. Filling a Superior Central Incisor ------- THE DENTAL JOURNAL Published Under the Auspices of the Dental Society of the University of Michigan. VOL. VIII. MAY, 1899. ORIGINAL CONTRIBUTIONS. Infection About the Teeth. NO. 3. BY C. G. DARLING, M. D., CLINICAL LECTURER ON ORAL PATHOLOGY AND SURGERY, UNIVERSITY OF MICHIGAN. Pericementitis, gouty pericementitis, dento-alveolar abscess, Pyorrhoea Alveolaris, etc., although they have been described as separate and distinct conditions, are nevertheless all manifestations of one and the same process, viz., infection. It is known that pus is always the result of a change effected in living tissue by the action of bacteria, the quantity and characteristics of the pus depending upon the form of the organism and the nature of the tissues. It is the expression of the effort which tissues make to rid themselves of disease. When germs gain a foothold in any part of the body and begin an attack upon the part, the natural defenders of the body, the leucocytes, immediately mass at that point for the purpose of combatting the invaders. The leucocytes destroyed in the struggle form the essential element of pus. Mingled with these, there will be found in a discharge of pus, blood serum, perhaps broken down red blood corpuscles, shreds of necrotic tissue, and swarms of bacteria. Tissues may be so altered by such diseases as syphilis, tuberculosis, rheumatism, gout and some of the infectious. fevers, that bacteria may easily gain a position most favorable to their growth and multiplication. Tissues thus weakened by disease offer but slight resistance to bacterial invasion. Having gained a suitable base of operation, germs defy the leucocytes |