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'' charged with a red Colour, it is mixed with the 
ufual Food of thefe Hogs; and this is what pro- 
duces this EfFed on their Bones, without caufing 
“ the leaft Alteration either in the Flcfh, Membranes, 
“ Cartilages, or any other Parts of the Body. Mr. 
Belchier-, whofe Obfervation here related has been 
“ communicated to the Public in N0442. and 443. 
“ of the Thilofophkal TranfaBicns, defiring to be 
“ affured whether the Madder alone, or all the In- 
gredients blended together, produced this Colour 
“ in the Bones, made fome other Experiments. 
“ He mixed fome of the Madder-root with the 
“ Food with which he intended to feed a Cock. 
“ The Cock dying within 16 Days after his firft 
“ feeding on the Madder ^ he diffeded him, and was 
“ furprifed to find, that the Root had produced its 
Effed in fo fmall a time; for he found the Bones 
“ univerfally of a red Colour. Whence he con- 
“ eludes, that the Madder alone caufes this Altera- 
“ tion ; as he had not mixed either the Iron, Alum, 
“ or any of the other Ingredients of the Dyer, with 
the Cock’s Food. He remarked, that the red Co- 
“ lour penetrated into the internal Parts of the Bones, 
and that the hardeft Bones took more of this Co- 
“ lour than the fofter ones ; excepting the enameled 
“ Part of the Teeth, which in the Hog retained its 
“ Whitenefs.” 
Mr. Belchier promifes, at the Clofe of his Obfer- 
vation, to try further Experiments, in order to know 
with Certainty, why this Change of Colour takes 
place only in the Bones. But as he has not publifhed 
any thing more than what I have above related, I 
think myfelf at Liberty to communicate to the Public 
the 
