Pennaneni Colours cfOpake Bodies. 209 



water, frefli ox gall and examined it, in the vial 

 (No. 63.) that part of itvvhich was in the neck 

 of the vial, and which was viewed by tranfmitted 

 light, was yellow, the anterior furface refiefled 

 no colour, but appeared black. 



Flefhconfiftsof fibrousveflelscontainingblood, 

 and is perfedly zvbite, when divefted of the blood, 

 by ablution. The membranes, finews, bones, and. 

 other folids, are xvhite^ and when they are freed, 

 from their aqueous and volatile parts, they are a 

 mere white earth, unalterable by fire, and capable 

 of imparting to glafs an opake whitenefs. 



Blood, diluted with warm water, v/as examined, 

 in one of the vials. It tranfmitted a red colour; 

 its anterior furface was almoft, but not entirely, 

 black. For it received a flight mixture of a brown 

 hue, from fome particles which were coagulated, 

 and werefufpended in the red liquor. 



That I might procure blood, fufficiently diluted, 

 and at the fame time, perfedly and equablv dif- 

 olved, I mixed as much red cruor, with fpiricof 

 fal ammoniac, as imparted to it a vivid red co- 

 lour. The liquor, thus compofed, was viewed 

 in the vial, (No. 64). That part of it, whjch 

 was contained in the neck of the vial, tranfmitted' 

 a bright red ; that which was viewed through the 

 anterior fide of the vial, refleded no colour but 

 was intenfelv^/^^/t. ' 



From thcfe obfervatlons, it appears that t'he^ 

 florid red colour of the flefh arifes from the lii^hc 

 Vol. II. i» which 



