falls far from all that has been expected from the pen of the author, showing a narrow range of recognition of electrotherapeutic application and indication.

The work is profusely illustrated, and is issued in the publisher's characteristic excellent style.

NEUROLOGICAL AND MENTAL DIAGNOSIS: A MANUAL OF METHODS. By L. PIERCE CLARK, M.D., Senior Attending Physician, Hospital for Nervous Diseases, New York; Visiting Neurologist to the Randall's Island Hospitals and Schools, New York; Consulting Neurologist to the Manhattan State Hospital, N. Y., and the Craig Colony for Epileptics, Sonyca, N.Y.; Assistant Neurologist, Vanderbilt Clinic (Columbia University); Fellow of the American Neurological Association, etc., and A. Ross DIEFFENDORF, M.D., Lecturer in Psychiatry in Yale University; Assistant Physician and Pathologist, Connecticut Hospital. for Insane; Member of the American Neurological Association, of the New York Neurological Association, of the New York Psychiatrical Society, and of the American Medico-Psychological Association, etc. New York: The Macmillian Company, 1908. All rights reserved. This practical volume fills a long-felt need. The thoroughness with which the writers have treated the subjects of neurological diagnosis and examinations will be valuable to both the specialist and general practitioner. Photographic illustrations indicating methods of diagnosis, facial appearances, atropies, motor-points, and the nerve distributions are of a quality unsurpassed in any work on neurology to the present time, indicating a degree of thoroughness and knowledge of technic deserving of commendation. The work should be in general use by the profession. The writers and publishers are to be congratulated on the general features and excellence of this work.

NEW AND IMPROVED APPARATUS.

This department is devoted to publishing, with illustrations, drawings, and descriptions, new apparatus, electrodes, etc., for the benefit of those interested in the progressive improvements in armamentaria. A NEW OZONE APPARATUS AND INHALER. A number of apparatus have been manufactured to generate ozone for therapeutic purposes, but in most cases no suitable contrivance has been provided to hold back or collect in solution the forms of nitrous oxide, allowing only the pure ozone to pass through for inhalation. Some of the so-called "ozone generators" consisted of two metal terminals fixed in a glass receptacle with two openings, through which the air enters to be decomposed, and the other for ozone and nitrous acid to pass out for inhalation. When the combined gases are thus inhaled the nitrous acid is irritating to the mucous-membrane, causing severe coughing, the ozone being only a small part of the gases generated, proves ineffectual.

The new apparatus shown in the accompanying cut is constructed identically the same as the large ozone plants for the purification of water. The chamber "A" is an independent vacuum, the same as chamber "B." The air passes through

EMACHLETTASON

B

the orifice "C." The current from the vacuum chambers discharge across the air space, decomposing the air into N, O,, N2 O1, N2 Os, and O,. The gases thus generated pass into the wash bottle attachment containing two parts of oil of pine needles and one part of oil of eucalpytus which absorb the nitrous oxides, allowing the pure ozone to pass through for inhalation.

It is a well-known fact that ozone is a great destroyer of organic life, and a deodorizer. It is a valuable therapeutic agent, provided it can be administered apart from the nitrous oxides.

The only safe and scientific method of separating the two gases is by absorption. When the nitrous oxides pass through the oil they unite and form terepin nitrites and are not acted upon by the ozone.

The apparatus is manufactured and for sale by E. Machlett & Son, 143 and 145 East Twenty-Third Street, New York City.

KNEE BRACE.

The accompanying cut represents a flexible knee brace, consisting of a pair of lateral stays, or supporting members made into coils of nickel-plated helmet bronze spring steel. The inside of each stay is cushioned by a pad of leather, which gives form to the coil and protects the leg.

The coils are held in position by five semi-bands of leather, the upper one makes support for the upper ends of the coils, and strong pressure against the posterior part of the leg; thus leaving the anterior part with Hunter's canal containing the femoral artery and vein free from all pressure.

The second and third semi-bands are attached near the center of the coils and make pressure against the anterior part of the limb just above and below the knee.. These bands are

so adjusted that the lateral stays produce no pressure upon the knee.

The two lower bands confine the lower ends of the coils and make pressure against the posterior part of the leg.

The brace when properly fitted is applicable to all knee affections where extension is imperfect. Walking is made easier by the assistance the brace gives in protecting the weakened knee from the entire weight of the body, and at each time the patient raises the affected limb from the ground the brace produces tension on the shortened tendons, ligaments, etc. Thus assisting the extensors of the limb in establishing perfect extension.

Every brace is guaranteed to give satisfaction, if not, the price of the brace ($10.00) is returned.

Five comparative points that will commend the use of the brace:

1. It is strong but extremely light in weight.

2. Frced extension is easily controlled and an effort to extend the leg perfectly each time it is raised from the ground.

3. Easily adjusted or removed-only two buckles to fasten or unfasten.

4. There is not a girdle to the brace which might interfere with the natural forces, nor is there the least pressure made upon the larger vessels of the limb.

5. Brace is worn beneath the clothing, which relieves the patient of that unsightly apparatus, so often objectionable. R. R. NORWOOD, M.D., Mineral Wells, Texas.

THE MCINTOSH ASEPTIC HEAD LAMP.

It is constructed along lines assuring greatest possible asepsis, having no unsanitary felt pads or unsightly cloth head band, but a finely nickeled metal brace with a plain leather strip to soften contact with head.

A modern tipless lamp of high efficiency, mounted in a fine polished aluminum reflector, throws a powerful diffused light

free from sharp lines and shadows and may be adjusted at any angle by means of a double ball and socket joint with which it is mounted.

All connections are made inside of the metal shell at back of reflector, avoiding awkward leather casings, while the entire instrument is finely finished and provided with rich silkcovered cord and handy separable plug connecting with any ordinary lamp socket.

Weight on head of metal brace, lamp and reflector is only eight ounces, making it extremely light and comfortable. Manufactured by the McIntosh Battery and Optical Company, 227-229 Washington Street, Chicago.

INDEX.