1*88] 
ftill more furprifing is, that neither the flefhy nor 
cartilaginous Parts fuffer the lead Alteration in Co- 
lour or in Tafte. 
The Diet with which thefe Hogs are fed is Bran, 
after it has been boiled in a Copper with printed 
Callicoes, in order to clean them from a dirty red 
Colour occafioned by an Infufion of Madder Root y 
which is.made ufeof to fix the Colours printed on 
the Cloth ; fome of which Colours are made with 
Preparations from Iron, others with a Mixture of 
Alum and Sugar of Lead. The Parts printed with 
the Preparation of Iron produce Black and Purple ; 
thofe printed with the Mixture of Alum, Red of 
different Degrees, according to the Strength of the 
Mixture. The Bran having abforbed the red Co- 
lour difcharged from the Cloth, is mix’d with the 
common Food of the Hogs, and produces this 
Effed on their Bones. 
Upon examining thefe Bones, I obferve in gene- 
ral the folid Parts to be moll: tin&ur’d, and the 
Teeth particularly, except the enamell’d Part, which 
is of a different Spbflance ; and upon fawing them 
through, I find the internal Parts equally tinged, ex- 
cept at the Ends of the Bones, where the Sub- 
ftance is more fpongy. And in order to difcharge the 
Colour, I have macerated them in Water for many 
Weeks together ; have boil’d them often, andfteep' 
ed them in Spirits, but all hath prov’d inefFedual ; 
nor is the leaf! Tindure given to any of the Li- 
quids, in which I have made Experiments. 
Whether this Colour is produced from the Mad- 
der only, or from all the Colours blended together, 
1 purpofe to make further Experiments. 
VIII. An 
