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Summary The potential of a silver impregnated adsorbent for the analysis of aromatic nitrogen heterocycles by high-speed liquid chromatography has been studied. With a UV monitor (254 nm) linear calibration curves were obtained and detection limits were 0.2–25 ng per injection (1-m column) for the compounds studied. A number of environmental residue samples and high-volume air filters were analyzed for possible interferences and/or the occurrence of any aromatic nitrogen heterocycles. The analysis of spiked air filter extracts gave results that were within 1–10% of known values. The future potential of the silver column and metal impregnated columns in general is discussed.

Having need for a portable blood-pressure machine and not being satisfied with the instruments now on the market, we have had an apparatus made which we believe to be the most satisfactory and practical sphygmomanometer for clinical use that has yet been devised.Our instrument is patterned after the Riva-Rocci, as used in the wards of the Johns Hopkins Hospital; this we have put into a compact, portable form, reducing the liability of breakage practically to nothing. The component parts of the apparatus are simple and inexpensive, therefore the cost of any necessary repairs would be trivial.An explanation is hardly necessary, as the accompanying illustrations clearly show the instrument ready for use and closed for transporting. The manometer tube is in two sections, connected by a rubber cuff and the scale is hinged, the break occurring at the 195 mm. mark. In ordinary cases there is no need of

Within the last two years there have been several reviews1 of the paravertebral triangle in pleural effusion, but I can find no mention of its occurrence in conditions below the diaphragm. It seems well worth while, therefore, to record a case of subphrenic abscess, without pleural exudate, in which this sign was well marked. When we consider the intimate anatomic relations of the pleural cavity and the subdiaphragmatic region, it seems not at all remarkable that a collection of fluid in one of these places should give many of the physical signs of exudate into the other.In the case reported here, that of a subphrenic abscess of the right side, there was an easily definable paravertebral triangle on the left, and in addition, movable dulness of 2 cm. in front; a line of flatness behind, rising from the spine toward the scapula and falling toward the axilla (Ellis'

In looking for pulsations which were not well defined and in the study of the outlines of organs and tumors I have had much help from the following simple maneuver:Over the area under inspection there is drawn with a skin pencil a square plaid figure, the squares of which are from 1.5 to 2.5 cm. in diameter and from 12 to 50 in number, according to the size of the area being studied. Any slight movement of the skin at any point in such a marked area causes a change in the direction of some of the lines and a distortion of the figure, and so renders visible movements of the internal organs which are not to be detected otherwise.In one case, a distended gall bladder, which gave no sign of its presence, was plainly visible at a distance of several feet when the plaid figure was drawn

The rapid increase in pellagra in some sections of our country should give rise to a conservative alarm, and any suggestions as to a possible etiologie factor should be made public, for not until the etiologic factor, or its method of transmission, is discovered, can any rational steps be taken toward the prevention of the disease. That there is great reason for a conservative alarm is apparent when we consider these facts: that the number of cases is increasing rapidly; that people in all walks of life are affected; that absolutely nothing is known as to how the disease is acquired, and that no certain hope can be offered to its victims.Because of our absolute lack of knowledge of how pellagra is acquired, and taking into consideration the rapidity of its increase, it appears to me a greater menace to a certain section of this country than syphilis or tuberculosis. We know