The use of sea voyages in medicine / By Ebenezer Gilchrist.

  • Ebenezer Gilchrist
Date:
1757
Catalogue details

Licence: Public Domain Mark

Credit: The use of sea voyages in medicine / By Ebenezer Gilchrist. Source: Wellcome Collection.

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    Hence, iH Britain, we have them two thirds of the year in fome of the foutherly or wefl- erly points. The fea being a greater fource of air, we find the caufe likewife, why ftorms continue longer at fea than at land. 3. Exhalations at land are from number- lefs different fubffances; and in a fmall trad of country we fhall find the air very different in qualities, and of a different temperature as to heat and cold. But air at fea is not impregnated with fuch various exhalations, the vapour being always of one kind, the fubjed from whence it is raifed being uni¬ formly and univerfally the fame. This va¬ pour likewife, exceeding greatly in quantity, will not beaffeded by the many and different exhalations at land, at any confiderable dis¬ tance at leaft, or to any degree. Sea air, therefore, is more eompad, becaufe more fimple, and confequently more elaftic. 4. Air at fea is better ventilated, or has in general a quicker and more conftant pro- greffion ; becaufe there are no impediments to its courfe, as at land, by mountains, hills, forefls. For this reafon it is more agitated, and purer, in oppofition to that foulnefs it contrads by ftagnating. That there is a ftagna-
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