zio Mr. Belaval on the Caiije of the 



•which is refleSled from the white fibrous fubflance, 

 and tranfmitted back through the red tranfparent 

 covering, which the blood forms on every part 

 of it. 



The blood, whilfl: recently drawn, does not 

 aCTume the appearance which is common to tranf- 

 parent coloured liquors, for, fuch liquors, when 

 toomafly to tranfmit light from their farther fur- 

 faces, are black. But blood, recently drawn, yields 

 a red colour, in whatfoever mafies it is difpofed. 



The colour, thus exhibited, arifes from a white 

 matter diffufed throughout the blood. The white 

 matter is eafily feparable from the red part of the 

 cruor. This may be performed, by dividing the 

 cruor, after it is coagulated, into thin pieces, up- 

 on which a fufficient quantity of water mufl be 

 poured. The cruor communicates a red tinge to 

 the water, which fhould be changed every day. 

 After a few days, the water no longer receives 

 any tinge, and the remaining maffes of the cruor 

 are, by thefe means, rendered perfeflly white. 



Thus it appears that not only the flefh, but 

 alfo the blood itfelf, are v/hite fubflances, tinged 

 with red particles. 



The red colour, which the fiiells of lobfters 

 aflume, after they are boiled, is a mcrefuperficial 

 covering, fpread over the white calcareous earth 

 of which the (hells are formed, and may be eafily 

 removed by fcraping, or filing the furface. 



Before 



