( *9 ) 
Share in this fuprizing Change. I doubt not but Blood 
of any kind, or Flelh of any kind, would produce the 
fame Effeds, but have reafon to believe the latter would 
not produce fo beautiful a Colour as the former. I 
purpofely dry’d fome Beef freed from its Skin and Salt, 
and purfued the fame Courfe as with the Blood j but 
there was a fenlible Difference to be obferv’d during the 
Calcination, and a very manifeft one in the Beauty of 
the two Colours, when finifh’d. 
To prove the Share the Blood has in this Change, 
the following Experiments (fome of which I had the 
Honour of fhewing before this Society) may be con- 
vincive. 
The Solution of Alum mix’d with that of the Vi- 
triol produceth no Alteration of Colour : if to thefe you 
add the Spiritus Salts, the Appearance is the fame y 
but if to the whole you put the Lixivium with Blood, 
there precipitates a Blue. 
If you fubftitute, inftead of the Lixivium with 
Blood, a Lixivium made with the fame Salt of Tartar 
only, which then becomes an 01. Tart art \ and after the 
Mixture of the Solution of Alum, with that of the 
Vitriol, you pour on this 01. Tartari , there follows 
indeed a Precipitation, but of no Colour ^ and if you 
add the Spirit of Salt, it fo ftrongly attracts what is 
precipitated, as to render the muddy Mixture perfectly 
clear. 
The very fame Effed will follow, if any Volatile 
Alcalious Spirit is made ufe of as a precipitant, or any 
Volatile Salts dilfolv’d in Water j nor can the Blood it 
felf befappofed to communicate this Change from any 
fuch Properties, the Heat of Fire it undergoes in the 
Calcination, being fufficient to throw them off. 
In the Calcination of the dry’d Blood and Salt of 
Tartar it was obferv’d, that there was a Lois of juft 
D 2 half. 
