( 3*0 
15 * Whether Harts-horn thaw’d , and fuch like fubftances,, 
ufing the fame method of Drilling, yield the lame quantity of 
Liquor 3 which they ufe to yield, when not frozen ? 
1 6. What Gold operates in the Fermentation of Liquors? 
1 7. Whether Birds and Wilde Beafts grow white there in 
Winter, and recover their native colour in Summer ? 
18. Whether Colours may be concentred by a fharp cold ? 
E. g. A ftrong Deco6lion of Cocheneel in a fit Glals? 
19. Whether the Eleffrical virtue of Amber , and the Attra- 
ctive and Directive force of the Magnet , be changed by a vehe- 
ment Cold ? -■■■.'■ . 
20. Whether pieces of Iron and Steel, even thick ones, be 
made britle by intenfe frofts 5 and therefore Smiths are obliged 
for prevention,to give their Iron and Steel-tools a fcfter temper? 
2 1. Whether accurate Obfervations evince, that all Fifties dye 
in frozen Waters,if the Ice be not broken? Where it is to be di- 
ligently inquired into, whether the Cold it felf, or the want of 
changing or ventilating the water, or the privation of Air, be the 
caufe of the death of Fifties ? 
22. Whether any Phyficians or Anatomifts have inquired, by 
freezing to death feme Animals (as Rabits, Pullets, Dogs, Cats, 
&c.) afterwhat manner it is,that Intenfe Cold kills men ? whe- 
ther they have found any Ice in the Inner parts , and if fo , in 
which of therm, Whether in the Ventricles of the Brain and Heart 5 
and in the greater Veflels ? 
Thefeivere the gm series recommended about a Twelve-month 
ago. Monfieur tUuelius in a late Letter of his, accompanied 
with feveral papers from others, returns this Accompt. 
Th e Inquiries you propofed to me, I did impart to feveral 
of my Learned friends : But hitherto I have attained an Ahfwer 
but to few particulars. Among the reft: you 3 find a Letter of the 
Learned Johannes Schejjerus , Profefior in the Swedijh Univer- 
fity at Vpjall, wherein he difcourfes handfomly of feveral things, 
being ready to entertain a Literary Commerce with you about 
fuch matters. Touching Amber , I am almofi: of the fame mind 
with him , that it is a kind of Eojpl Titch or Bitumen , feeing it is 
not only found on the Shore of the Borujjian Sea, but alfo diggd 
up in fiibterraneous places 5 fome German miles diftant from the 
■* : 6e-a 5 . 
