
Led. I. The Power of Mixture. 
233 

3. §. Firft, For the Imitation of an Animal Body, 1 will inftance ih 
Fat. Which may be wade thuss Take Oy Olive, and pour it upon 
high Spirit of Nitre. Then digeff them for fome days. By degrees. 
the Oy! becomes of the colour of Marrow 5 and at laft, is congealed or 
hardned into a white Fat or Butter, which diffolveth only by the fire as 
that of Avimals. In converting Oyl thus into Fat, it is to be noted 
That it hardens moft upon the exhalation of fome of the more Sul- 
phureows parts of the Spirit of Nitre. Which I effected, well enough 
for my purpofe, by unftopping the glafs after fome time of digefti- 
on 5 and fo fuffering the Oy! to diffolve and thicken divers times byfuc- 
ceflive heat and cold, Hence, The true Congealing Principle, isa Spi- 
rit of Nitre féparated from its Sulphur. For the better doing whereof, 
the Aer isa moft commodious Menstruum to the faid Spirit of .Nitre. 
Whence alfo, if we could procure fuch a Spirit of Nitre, we might con- 
geal Water in the midft of Summer. We might alfo refrigerate Rooms 
herewith Artificially. And might Ivsitate all frofty Meteors. For the 
making of Fat, is but the Durable Congelation of Oyl: which may be 
done without fro, as I have fhewed how. 
Hence alfo it appears, That Avimal Fat it felf, is but the Curdling of 
the Oyly parts of the Blood; either by fome of its own Saline parts 5 
or by the Nitrous parts of the Aer mingled therewith. 
Hence likewife it is, That fome Avimals, as Conies, and Fieldfares, 
grow fatier in frofty weather: the oily parts of the blood, being then 
more than ordinarily coagulated with a greater abundance of zitrous 
parts received from the Aer into their bodies. 
For the fame reafon it is, That the Fat of Land-Avimals is hard 5 
whereas that of Fifhes is very oft, and runs all to Oy/, fc. Becaufe 
the Water, wherein they live, and which they have inftead of breath, 
hath but very few vitrous parts in it, in comparifon of what the Aer 
hath. 
4. §. Secondly, For the Imitation of a Vegetable Body, 1 will give 
three Inftances ; In Rofiz, Gum, and a Lixivial Salt. The firff may 
be made thus ; Take good Oy! of Vitriol, and dropit upon Oy! of Anife- 
feeds 5 and they will forthwith izcorporate together 5 and by degrees, 
will harden into a perfed Rofiz, with the geveral and defining Properties 
of a truly Natural Refinous Gum. Being not at all diffoluble in Water 3 or 
at leaft, not any more, then any natural Rofiz or Gus yet very eafily 
by fires as alfoshigly ixflamable: and exceeding friable. Although this 
Artificial Rofin, be the refalt of two Liquors, both which very ftrongly 
affect the Senfe: yet being well wa/hed from the unincorporated parts, 
(which isto be done with fome care) it hath fcarce any Taft or Smell, 
The Concentration of thefe two Liquors, is likewife fo univerfal 5 that 
the Rofiz is not made by Precipitation, but almolt a total Combination 
of the faid Liquors and that with fcarce fo much, as any 22/ible fumes. 
5. §. Again, Having taken a certain Powder and a Saline Liquor, 
and mixed them together in a bottle, and fo digeffed them for fome 
time ; the Powder was at laft tranfmuted to a perfec Oily Gume 5 which 
will alfo difolve either in Oylor in Water 5 inthe {elf fame manner, as 
Galbanum, Ammoniac, and the like will do. 
6. ¢. And Laftly, A Lixivial Salt may be imitated thus; Take 
Nitre, Oyl of Vitriol, and high spirit of Wine, of each a like quantity. 
Of thef three Bodies, not any to being put together, that is to fay 
Na neither, 



























































