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• W4248175083 abstract "London. Royal Society, February 6.—Sir Archibald Geikie, K.C.B., president, in the chair.—S. R. Wells and Leonard Hill: The influence of the resilience of the arterial wall on blood pressure and on the pulse curve. The form of the pulse curve and the systolic and diastolic pressure (measured by the sphygniomanometer in the case of man) are modified very greatly by the conduction of the pulse along any particular artery. The conduction varies with the resilience of the arterial wall. An artery which is contracted, and therefore more rigid, conducts the systolic crest almost with undiminished amplitude from the heart to the peripheral vessels, and there is in such an artery a wide difference between the systolic and diastolic pressure. In a relaxed, resilient artery, on the other hand, the systolic wave expands the wall of the artery, and part of its energy is stored up as potential energy in the wall. As this comes into play during diastole and the systolic wave reaches the peripheral vessels in diminished form, the height of the diastolic wave is approximated to that of the systolic. The arteries are controlled so as to bring about one or other of these conditions at the periphery—a hammer-like pulse with big difference between systole and diastole, or a pulse with small difference and a more uniform mean pressure. The evidence for these conclusions has been drawn both from the investigation of thin-walled rubber tubes (specially made) and of arteries.—A. A. Gray: The occurrence of a ganglion in the human temporal bone, not hitherto described. The ganglion referred to in the title was found in the human temporal bone, below and in front of the stapedius muscle. In the specimen in which it was discovered the ganglion was comparatively large, but it is probable that considerable variations in this respect occur in individuals. So far as present investigations show the ganglion is associated with two nerves—the facial nerve and Arnold's nerve—but it is possible that fibres from other nerves may enter the ganglion.—J. A. Gunn and F. B. Chavasse: The action of adrenin on veins, (1) The action of adrenin upon ring preparations of veins remote from the heart is to diminish their calibre, as in the case of arteries. They, therefore, probably contain veno-constrictor nerve fibres from the thoracico-lumbar sympathetic system. (2) The action of adrenin on quiescent rings from the superior vena cava near the heart is to cause them to beat rhythmically and powerfully. (3) (a) The accelerator-augmentor nerve supply of the heart, and (b) the rhythmically contractile tissue, extend up the superior vena cava for at least 6 to 8 mm. from the veno-auricular junction in the heart of the sheep. (4) The induction by adrenin of rhythmic contraction in the quiescent superior vena cava seems, on the whole, in accordance with the myogenic theory of mammalian heart rhythmicity.—Capt. H. S. Ranken: A preliminary report on the treatment of human trypanosomiasis, and yaws, with metallic antimony. The pbject of this preliminary report is to demonstrate that intravenous injection of metallic antimony in a fine state of division is a therapeutic measure applicable on a large scale to the treatment of human trypanosomiasis. A considerable number of cases have been treated by this method, and in a further series combined treatment was employed, salvarsan or atoxyl being given in addition to the antimony. As a routine dose, one grain of antimony was eriven in four to six ounces of physiological salt solution. Summaries of results of the various series are given. In the great majority of cases treatment brought about considerable improvement, as evidenced by disappearance of trypanosomes from the blood and lymphatic glands, improvement in nutrition, mental state, &c.—Major W. B. Fry and Capt. H. S. Ranken: Further researches on the extrusion of granules by trypanosomes and on their further development. With a note by H. G. Plimmer on a new method of blood fixation. Following a short description of methods used in these investigations, the paper deals with the subject of granules in general in trypanosomes. Two classes of granules are referred to:—(a) Those representing probably stored food material, and (b) those of nuclear origin and character, with which latter only the paper is concerned. Descriptions of the mechanism of extrusion are detailed as observed to take place in human and animal varieties, and the influence of drugs and other effects are discussed in this connection. A description of the free granule and its after-development and fate is given. A section on fixed and stained specimens follows, the earlier sections of the paper dealing in general with observations made of the parasite in the living state." @default.
• W4248175083 created "2022-05-12" @default.
• W4248175083 date "1913-02-01" @default.
• W4248175083 modified "2023-09-30" @default.
• W4248175083 title "Societies and Academies" @default.
• W4248175083 doi "https://doi.org/10.1038/090662a0" @default.
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