and all those that follow them. Moreover, I cannot subscribe to his opinion, That _Gas and Blas from the Stars do make heat_: For heat is made several ways, according to its several sorts; for there is a dry heat, and a moist heat, a burning, melting, and evaporating heat, and many more. But as for _Meteors_, that _they are made by Gas and Blas_, I can say nothing, by reason I am not skilled in Astrology, and the science of the Heavens, Stars, and Planets; wherefore if I did offer to meddle with them, I should rather express my Ignorance, then give your _Ladiship_ any solid reasons; and so I am willing to leave this speculation to others, resting content with that knowledg Nature hath given me without the help of Learning: Which I wholly dedicate and offer to your _Ladiship_, as becomes, Madam, _Your faithful Friend_ _and Servant._ [1] In the _ch._ of _Air._ VII. _MADAM,_ Having made mention in my last of your _Authors_ opinion, _That Air is in its nature Cold_, I thought it fit to take a stricter view of the temper of Air, and to send you withal my own opinion thereof. First of all, I would fain know, what sort of Air your _Author_ means; for if he thinks there is but one sort of Air, he might as well say, that there is but one sort of Animals, or Vegetables; whereas yet there are not onely different sorts of animal and vegetable kind, but also different particulars in one and the same sort: As for example; what difference is not amongst Horses, as between a Barb, a Turk, a Ginnet, a Courser of _Naples_, a Flanders-horse, a Galloway, an English-horse, and so forth? not onely in their shapes, but also in their natures, tempers and dispositions? The like for Cows, Oxen, Sheep, Goats, Dogs, as also for Fowl and Fish, nay, for Men. And as for Vegetables, What difference is there not between Barly and Wheat, and between _French_-barly, _Pine_-barly, and ordinary Barly; as also our _English_-wheat, _Spanish_-wheat, _Turkish_-wheat, _Indian_-wheat, and the like? What difference is there not amongst Grapes, as the _Malago, Muscadel_, and other Grapes, and so of all the rest of Vegetables? The same may be said of the Elements; for there is as much difference amongst the Elements as amongst other Creatures. And so of Air: for Air in some places, as in the _Indies_, especially about _Brasilia_, is very much different from our air, or from the air that is in other places: Indeed, in every different Climate, you shall find a difference of air, wherefore 'tis impossible to assign a certain temper of heat or cold to air in general. But although my sense and reason inform me, that air in its own nature or essence is neither hot nor cold, yet it may become hot or cold, by hot or cold motions; for the sensitive perceptive motions of Air may pattern out heat or cold; and hence it is, that in Summer, when as heat predominates, the air is hot; and in Winter, when as cold predominates, the air is cold. But, perhaps,