248 Parts of Auimals mixed Lea. IL 
8. $. Harts-Horn makes a confiderable Bullition and huff, even with 
Oylof Vitriol, which the reit of the Bodies abovefaid, will not do. But 
with spirit of Nitre, it makes yet a greater. From the foregoing Ex- 
periments, and almoft all that follow, what is before aflerted of 
the salts of Vegetables and Minerals, is here alfo evident concerning that 
of Animals, foil. That it is not made, but only separated by the fire. 
It likewife hence appears, That the proportion of Salt in the forementi- 
oned parts is very different; and that therefore fome of them are never, 
and none of them but with good diferetion, tobe fubftituted one for 
another in Medicine. As alfo, that there is a different proportion of 
Salt in the feveral Animals themfelves, to which the faid Parts belong. 
9. 5. Next for fhells 5 as thofé of Lobfters, Eggs, Snails and Oifters: 
all which make an Efervefeence, both with Oyl of Vitriol, and Spirit o 
tre. But with Spirit of Nitre the greatest. Lobfter-(hells make a confiderable 
Bullition and huff,but no noife nor fleams. Egg-fhells make a Bullition and 
huff, with fome noife, but no fleams.  Snail.fbells make an Effervefcence 
with noife and fleams. Oyfter-/hells make one with the grateft noifè and 
thickeft fleams. Hence we may judge, in what cafe to adminifter one 
more appofitely than another. As alfo in what proportion, according to 
their different ftrength. Some may be better for Children, as being 
milder. Or for a Body whofe very fharp Blood or other Humors, are 
more eafily kindled into Ferments. Or elfe may be fafelt, toavoid a 
fudden precipitation of the Humors 3 or for fome other caufe, 
10. $. Oyflerells, and the refe above-faid, make a quicker Efer- 
vefcence, not only with Spirit of Nitre, but even with Spirit of Salt, than 
they do with Oyl of Sulphur, or Oylof Vitriol. So that thefe bodies, as 
well as Metals, have their proper Menftrunms whereby they are be 
diffolved. 
11. $.. Egg-fhelís calcined, make with Oyl of Sulphur, or Oyl of Vie 
triol, or Spirit of Nitre, a greater Effervefcence, than when uncalcined. 
As alfo with fleams, which uncalcined, they produce not. The like is 
‚Sen in calcined Oyfter-fhells. And the longer the Calcination is continued, 
the quicker and fronger will be the Bffervefcence. This I tryed at feveral 
terms, from a quarter of an hour, to five hours. So that after fo long a 
Calcination, they make an Effervefcence almof inftantaneous. The realon 
hereof is,Becaufe the feveral Principles whereof the Shells confift, being 
relaxed, and the Sulphur for the greateft part, driven away by the fire 5 
the remaining Salt lies now more open and naked to the attaque of the 
Menfiruum, (o foon as ever they are mixed together. From hence it is 
plain, That Egg-/hells, and the others above-faid, being burnt, are far 
Stronger Medicines, than when wzburnt. It is hereby likewife evident, 
That a great portion of their Salt, is not a.volatile, but a fixed Alkaly. 
Tothefe may be fubjoyned all kinds of thelly Jes. I will inftance 
in three or four. 2 
12. $. And firft Bees, with oyl of Vitriol, ftir not in the left. With 
Spirit of Nitre they make an exceeding fall Bullition, without any eleva- 
tion, 
13. $. Cochinele (the Nefi of an Infe ) makes fome Bullition with 
Oyl of Vitriol, but very fmall : for the bubbles are not to be feer without a 
Glafs, But with Spirit of Nitve the Bullition is more vifible, and joyned 
with fome elevition, 
14. $ 
