It may therefore be reasonably concluded, that the Eknèfiai Winds, when approaching or opposed to the Apogay, shoud be considered as Ground Winds, (i. e. Winds blowing next the Surface of the Earth, tho’ they be supposed at the same Time to descend) which receive the Apogay above them: and that the Apogay being warm light and moist, (which last will have the same Effect, as if they were more elastic;)[81] being also more turbulent, and endued with greater Velocity, press back the Eknèfiai from the Surface of the Earth, and upwards; and at the same Time flow above them.
By which means the Eknèfiai partake of their Qualities;—become less cold, less heavy, and less dry.[82]
CHAPTER LI.
Section 275. IF then this Reasoning be allowed; aërial Travellers will not be subject, when, at a considerable Height, even in Winter, to great Degrees of Cold, supposing that the Air does not actually freeze the Waters below; and the Apogay or Southerly Winds have continued for a few Days.
On the Contrary; Aironauts may expect Cold, encreasing with their Ascent, even in Summer, tho’ warm below; supposing the Eknèfiai or Northerly Winds to have continued but for a Day before the Ascent: they may possibly, indeed by soaring higher, rise into the regular Stratum of the warm Apogay floating above them.
276. From what has been said, there seems a Degree of Probability, that the Air for a Number of Miles, above warm cultivated Plains shoud differ materially in its Temperature, from Air above Mountains, or even on a Level with their Summits.
That the former Air, in moderate Weather, shoud continue warm and rarefied: while the latter is cool and condensed.
For the same Reason the Air over the Sea, on the Hours of Accumulation; i. e. during the Night, in Summer, and frequently in Winter, shoud be found warm and rarefied: especially during a Continuance of the Apogay Winds.
277. It is likewise probable that the Atmosphere will be found respirable at much greater Heights, than is at present imagined: during the Continuance of the Eknèfiai Winds; and also, on Account of the defloguisticated Air,[83] which is drier and less elastic in Proportion to its Rarity.[84]