you will say, air may be cooled by moving it with a Fan, or such like thing which can make wind; wherefore it follows, that air must needs be naturally cold. I answer, That doth not prove Air to be in its nature cold: for this moving or making of wind may contract or condense the air into cold motions, which may cause a cold wind, like as Ventiducts, where the air running thorow narrow Pipes makes a cold wind. The same may be done with a mans breath; for if he contract his lips close, his breath will be cold, but if he opens his mouth wide, his breath will be warm. Again: you may say, that rain is congealed by the coldness of the air into Snow, Hail and Ice. I answer; Frost, Ice, Snow and Hail, do not proceed from the coldness of the air, but rather the coldness of the air proceeds from them; for Ice, Snow, and Hail, proceed from cold contraction and condensation of a vaporous or watery substance; and, as Frost and Snow cause air to be cold, so Thunder and Lightning cause it to be hot, so long as they last. Thus, _Madam_, though Air may be altered either to heat or cold, yet it is neither hot nor Cold in it self. And this is all for the present that I can say concerning the Temper of Air; I conclude, and rest, Madam, _Your constant Friend,_ _and faithful Servant._ VIII. _MADAM,_ Having hitherto considered your _Authors_ Elements or Principles of Natural things, you will give me leave to present you now with a short view of his Opinions concerning Wind, Vacuum, Rainbows, Thunder, Lightning, Earth-quakes, and the like; which I will do as briefly as I can, lest I betray my Ignorance; for I confess my self not to be well versed in the knowledg of Meteors, nor in those things which properly belong to the Mathematicks, as in Astrology, Geography, Opticks, and the like. But your _Author_ says, in the first place,[1] That _Natural Wind is nothing but a flowing Air, moved by the Blas of the Stars._ Certainly, _Madam_, if this were so, then, in my judgment, when the Stars blaze, we should have constant Winds, and the more they blaze, the more violent winds there would be: But I have rather observed the contrary, that when the Stars blaze most apparently, we have the calmest weather either in Summer or Winter. Perchance your _Author_ will say, he doth not mean this apparant and visible Blas, but another invisible Blas. I answer; I know not, nor cannot conceive any other Blas in the Stars, except I had seen it in a Vision; neither do I think that Nature her self knows of any other, But your _Author_ doth refer himself upon the Authority of _Hypocrates_, who says, That _not onely the Wind is a blast, but that all Diseases are from blasts; and that there is in us a Spirit stirring up all things by its Blas; which Spirit, by a Microcosmical Analogy, or the proportion of a little World, he compares to the blasts of the world._ As for my particular, _Madam_, I dare say, I could never perceive, by my