VENTILATORS. 45

ei and the Cohesion of its Parts; it must by" degrees grow less and less fit for the Pur-" poses of Life: So that by degrees the“ Blood will- be so impaired and broken," that when it most wants the Assistance of“ the Lungs, it Will be brought thither,“ when it is only fit to choak up and clog" the Vesicles, and capillary Arteries, so" as to prevent the receiving the service it" could receive in passing through the" Lungs."-—— Hence, ’tis no wonder thatWhen we breathe an Air, thus loaded withVapours, it should be apt to cause, what arecalled Goal-Distempers; which Inconveni-ence might in a great measure be prevented,if such close Places were ventilated withfrelh Air; for want of which, many unhap-py Persons are not only deprived of Liber*ty, in Goals, but too often even of Life also.

56. I t has long been found of some Be-nefit towards the purifying the Air in Ships,to walh and sprinkle them with Vinegar be-tween Decks. I wrote the following Pro-posal to Dr. Martin , Physician to the lateLord Cathcart, about two Months beforethey failed from Spithead in the Year 17405

viz.