Let. with feveral Menfiramms. 247 
46. 5. Oyl of Vitriol and Spirit of Salt, though both acids, yet 
make a ftrong Effervefence, with noife and fumes. Which further con- 
dm what was noted before, fe. that Spirit of Salt isa Jubalkaline 
Acid. 
47. §. Spirit of Salt Armoniac,with Oyl of Vitriol, makes an Efjen 
wefcence fo extraordinary quick, and as it were inftantancous,that nothing 
feemeth quicker. Whence it is probable, That if Gun-powder were 
made of Salt Armoniac, inftead of Nitre, or with both mixed together; 
it would be far ftronger, than any kind now in ufe. And thus far for 
Minerals. 
48. $. Ihave only one Corollary to add, from the whole; which 
is, That whoever doth undertake the Natural Hiftory of a Country, 
(fach as that the Learned Dr. Plot hath exceedingly well done of Ox- 
Jordfhire ) the foregoing Method, feemeth fo ealie, cheap, and inde- 
ceitful, for the finding out and well diftinguifhing the natures of all 
kinds of Metalls, Ores, Salts, Earths, Stones, or other fibterraneal Bo- 
dies 5 as cannot, ‘I think, be fupply'd, but by others of greater difficul- 
ty and expence. 
CHAP. IIL 
What may be obferved of the PARTS of Animals. 
Y NO W proceed tothe feveral Parts of Animals 3 as 
Hairs, Hoofs, Horns, Shells and fhelly ee Bones, 
Filefh and the feveral Vifcera, Silk, Blood,Eges,Musk , 
Caftor, Gall, Urine, Dungs, Salts and Stones. 
2. §. And firft of all, the Hair of a mans head, 
with Oyl of Vitriol, maketh no Bullition at all. Nor 
SS > yet mith Spirit of Nitre. So that although it con- 
tains a good deal of volatile Salt ; yet it feemeth either not to be alka- 
line, or elfe is centred in fo great a quantity of Oyl, that the acid men- 
Jiruum cannot reach it. 
3. $, Hares Fur, with fpirit of Nitre, maketh, although a fhort, yet 
very plain Bullition and huff. Hence the Hair, and therefore the Blood, 
of fome Animals, is fuller of Salt, at leaft of an Alkaline Salt, than 
that of ome others. And perhaps the Hair of fome men, as of Black's, 
may be fo full of Salt, as to make a Bullition like Hares Fur. 
4. $. The havings of Nails ftir not at all, either with Oyl of Vitriol, 
or Spirit of Nitre : only with the latter they turn yellow. But Elks Claws, 
with Spirit of Nitre, mike a finall and flow Bullition. 
5. $. Horfes Hoof, with Oyl of Vitriol, ftirs not of many hours. But 
with Spirit of Nitre, allowing it fome time, makes avery plain Bullition, 
and huffs up very high. 
6. $. Cows Horn, neither with Oyl of Vitriol, nor with Spirit of Ni- 
tre, maketh any Bullition, only turneth to a yellow colour. 
7. $. Rams Horn firs not with Oyl of Vitriol ; but with Spirit of 
Nitre, makes a fall and flow Bullition. 
8. ge 
