Lea. I. The Power of Mixture. 233 
3. $. Firft, For the Imitation of an Animal Body, I will inftance in 
Fat. Which may be made thus; Take Oy! Olive, and pour it upon 
high Spirit of Nitre. Then digef? them for fome days. By degrees, 
the Oy! becomes of the colour of Marrow ; and at laft, is congealed, or 
hardned into a white Fat or Butter, which diffolveth only by the fire, as 
that of Animals. In converting Oy! thus into Fat, it is to be zoted, 
That it hardens molt upon the exhalation of fome of the more Sul- 
phureous parts of the Spirit of Nitre. Which I effected, well dee 
for my purpofe, by unftopping the glafs after fome time of dige/ti- 
on 5 and fo fuffering the Oy! to difolve and thicken divers times byfuc- 
ceflive heat and celd. Hence, The true Congealing Principle, isa Spi- 
rit of Nitre feparated from its Sulphur. For the better doing whereof, 
the Aer isa moft commodious Menstyumm 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. Andmight Imitate all frofiy Meteors. For the 
making of Fat, is but the Durable Congelation of Oyl: which may be 
done without frost, as I have fhewed how. 
Hence alfo it appears, That Animal Fat it (elf, is but the Curdling of 
the Oyly parts of the Bloods cither by fome of its own Salime parts 5 
or by the Nitrous parts of the Aer mingled therewith. 
Hence likewife it is, That fome Animals, as Conies, and Fieldfares, 
grow fatter in frofiy weather : the oily parts of the blood, being then 
more than ordinarily coagulated with a greater abundance of nitrous 
parts received from the Aer into their bodies. 
For the fame reafon it is, That the Fat of Land-Animals is hard 5 
whereas that of Fäfes is very fof, and runs all to Oyl, fè. Becaufe 
the Water, wherein they live, and which they have inftead of breath, 
hath but very few sitrons parts in it, in comparifon of what the Aer 
hath. 
4. $. Secondly, For the Imitation of a Vegetable Body, 1 will give 
three Inflances 5 In Rofin, Gum, and a Lixivial Salt. The frf may 
be made thus; Take good Oy! of Vitriol, and dropit upon Oy! of Anife- 
feeds 3 and they will forthwith ¿»corporate together ; and by degrees, 
will harden into a perfec Rofin; with the general and defining Properties 
of a truly Natural Refinous Gum. Being not at all diffoluble in Water ; or 
at leaft, not any more, then any natural Rofin or Gum: yet very eafily 
by fire: as alfo.higly inflamable : and exceeding frable. Although this 
Artificial Rofin, be the refult of two Liquors, both which very ftrongly * 
affe&t the Senfe : yet being well wa/bed from the unincorporated parts, 
(which is to be done with fome care ) it hath fcarce any Taft or Smell, 
The Concentration of thefe two Liquors, is likewife fo univer/al ; that 
-the Rofin is not made by Precipitation, but almoft a total Combination 
of the faid Liquors and that with fcarce fo much, as any viffble fumes. 
5. $. Again, Having taken a certain Powder and a Saline Liquor, 
and mixed them together in a bottle, and fo digefled them for fome 
time 5 the Powder was at laft tranfinuted to a perfect Oily Gum 5 which 
will alfo difolve either in Oylor in Water 5 inthe felf fame manner, as 
Galbanum, Ammoniac, and the like will do. 
6. $. And Lafily, A Lixivial Salt may be imitated thus; Take 
Nitre, Oyl of Vitriol, and high spirit of Wine, of each a like quantity. 
Of thefe three Bodies, not any two being put together, that is to fay 
Nn neither, 
