Philosophical observations on the senses of vision and hearing ; to which are added, a treatise on harmonic sounds, and an essay on conbustion and animal heat / by J. Elliott, apothecary.

  • Eliot, John, Sir, 1736-1786.
Date:
1780
Catalogue details

Licence: Public Domain Mark

Credit: Philosophical observations on the senses of vision and hearing ; to which are added, a treatise on harmonic sounds, and an essay on conbustion and animal heat / by J. Elliott, apothecary. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    fercnfc with, regard to gravity or levity, and this fcems, by experience, to be the cafe. There are however,' methods of conceiving how phlo- gifton may diminifh the gravity of bodies; or do metals, Sec. attract air, when calcined, in lieu of their phlogifton, and thereby have their weight increafed I for an efFervefcence attends the reduction of thofe calxes *, as I find by the Chymical Dictionary : mould this latter be the cafe,, it would appear (and it would be a little extraordinary) that error had led to me truth. The above, as it has accidentally been the fource of right, fo it has alfo of wrong reafoning, as may be feen in the courfe of the Vllth. fec- tion. I do not however find reafon to reject the general fyflem faggefted in that fection y and am ftill inclined to think that JEt/ier, Fire, Phlogifton, and Earth are the four principles of * Dr. Prieftley mews that dephlogifticated air may be expelled frorii the calx of lead. The dephlogifticated air may have been formed of fixed air which the calx had attract- ed, and afterwards decompofed. (Vide § VI.) which