Licence: Public Domain Mark
Credit: An essay on respiration. Pts I-II / By John Bostock, M.D. Source: Wellcome Collection.
Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.
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![Of his lungs in a flate of complete expiration amounts to no more than 41 cubic inches, (a) It is difficult to reconcile thefe eftimates with thofe of Dr. Menzies, which were apparently deduced from accurate and well contrived expe- riments. With refpecl: to Mr. Davy's method of determining the bulk of a Tingle infpiration, we may remark in general, that the quantity of air taken into r-the lungs varies fo much at different times, and depends in fo great a degree upon the will, that other circumftances being the fame, thofe experiments will ffand tl]e beft chance of accuracy in which an average is talc en from a confiderable number of infpirations ; in this par- ticular the experiments of Dr. Menzies pofTefs a decided fuperiority. There is alfo another cir- cumftance to be noticed with refpecl: to the pe- culiar apparatus employed by Mr. Davy, which may be fuggefted as a probable caufe of inaccu- racy. He informs us that he attempted to breathe in the mercurial air-holder ip fuch a manner that the refpiration might require no unufual effort, and he concludes, that in this cafe the function would be exercifed in the fame manner as in its natural flate. But in breathing into this appa- ratus,](https://iiif.wellcomecollection.org/image/b2129916x_0040.jp2/full/800%2C/0/default.jpg)
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