A medical handbook : for the use of practitioners and students / by R.S. Aitchison.

Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: A medical handbook : for the use of practitioners and students / by R.S. Aitchison. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    appears lengthened and the nose pinched; and the expression is dull and unintelligent. The tonsils are usually enlarged the fauces relaxed, and the posterior wall of the pharynx seems set <ieeplyback The voice is altered, and the breathing, in advanced cases, may be very noisy and snuffling, especially during sleep. A reflex cough Ind various other neuroses, may be the result of adenoids. The chUd is usually pale and strumous-looking, with possibly enlargemen o the ymphadc cervical glands. The .../^ removal of-^--^^^ not only allows of better facial configuration, but is of immediate and marked benefit as regards the general health.] Percussion. Although more fully discussed in special works upon physical diagnosis^t is necessafy here to sketch the theory of percussion and its l^ractical application to medicine, especially to diseases of the el e t The subject is a difficult one, and it is rendered more so by the different views of authors, and by the confusion m the use of term which have, in practice, been generally applied without regard to the scientific nomeAclature and to the properties of sound While endeavouring, so far as possible, to reconcde these different view an att mpt will be made only to. briefly formulate the simple characteristics of sound, which are concerned in the production of percussioniones, and to point out what is practically necessary for vibrations of tie particles of elastic bodies, which generally reach the ear through the medium of undulations in he air. Tf a small steel rod be fixed at one end withm a vice, and if the free end be stiuck, sound will result, and the yibratory movement tions graphically. Fig. 12.—Sound-vibrations. Tone depends ^on^ ^IS^^.^LT^I'^-J^S be rhythmical and sufficiently ra^Jid ana^^^^^^^^^ the higher the pitch. The ''^'Jb The Mion of upon the a.,piiiude of the -^'^ ^,,,Uons last-C to D. tile sound is the time dunng wh.c g^e vib condensation The u>MoHs in h'^,^^' ^ ^^^^^ J'f Z in contact with the vibrat-