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15. Whether Harts-horn thaw'd, and such like substances, using the same method of Distilling, yield the same quantity of Liquor, which they use to yield, when not frozen?
16. What Cold operates in the Fermentation of Liquors?
17. Whether Birds and Wilde Beasts grow white there in Winter, and recover their native colour in Summer?
18. Whether Colours may be concentred by a sharp cold? E.g. A strong Decoction of Cocheneel in a fit Glass?
19. Whether the Electrical virtue of Amber, and the Attractive and Directive force of the Magnet, be changed by a vehement Cold?
20. Whether pieces of Iron and Steel, even thick ones, be made britle by intense frosts; and therefore Smiths are obliged for prevention, to give their Iron and Steel-tools a softer temper?
21. Whether accurate Observations evince, that all Fishes dye in frozen Waters, if the Ice be not broken? Where it is to be diligently inquired into, whether the Cold it self, or the want of changing or ventilating the water, or the privation of Air, be the cause of the death of Fishes?
22. Whether any Physicians or Anatomists have inquired, by freezing to death some Animals (as Rabits, Pullets, Dogs, Cats, &c.) after what manner it is, that Intense Cold kills men? whether they have found any Ice in the Inner parts; and if so, in which of them; Whether in the Ventricles of the Brain and Heart; and in the greater Vessels?
These were the Quæries recommended about a Twelve-month ago. Monsieur Heuelius in a late Letter of his, accompanied with several papers from others, returns this Accompt.
THe Inquiries you proposed to me, I did impart to several of my Learned friends: But hitherto I have attained an Answer but to few particulars. Among the rest you'l find a Letter of the Learned Johannes Schefferus, Professor in the Swedish University at Upsall, wherein he discourses handsomly of several things, being ready to entertain a Literary Commerce with you about such matters. Touching Amber, I am almost of the same mind with him, that it is a kind of Fossil Pitch or Bitumen, seeing it is not only found on the Shore of the Borussian Sea, but also digg'd up in subterraneous places, some German miles distant from the
