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 of peftikntial Di/eafes. i FROM a cold and molft Air, we have little complained of, as to their occafion- ing thefe Difeafes, unlefs fuch a Conititu- tion lets in immediately upon a contrary Extream •, for all Hidden Changes of Wea- ther are more or lefs unhealthful, as well as in other Refpe£ts of living *, for which Reafon particularly, Cam. Celjus advifes to be very flow in all Alterations of Moment: And SanHorius frequently inculcates the fame in his jlfhcrifms, and tells us (a) how it is hurtful, both to go fiiddenly out of a hot Air into a cold one, and out of a cold Air into a hot one :, and is alfo very particular (b) in the Inconveniencies of fuch a Con- ftitution of Air we are now fpeaking of^ fetting in after the Heat of Summer. H'q- focrates (c) does tell us of a Tefillence from long continued cold Rains, as likewife does Fer- ndius (d but fuch Inflances are nol* common, THE laft Conttitution _of Air we are to take Notice of, is that which is co'd and dry, againfl: which there are a great B 3 many (a) Medicina Statica, Se&. 2. Aph. 18. (b) Ibid. Aph. 6, and 29. (c) Lib. 3. Epidem. (d) De Abdit. Lib. 2. Cap. 12.