[409] 
an experiment made publickly before the Society of 
Arts, Commerce, &c. and which gave them a fa- 
tisfadtory demonftration of the great difference in 
nature between Corallines and vegetable fubftances. 
It happened upon the following occalion. A gentle- 
man of Wales had fent the fociety a parcel of Lichen 
tartareus, of Linn. Ed. 2. Sp. Pi, 1608. as a propet 
material for dying a red colour, to anfwer the fame 
purpofe of that expenfive article among the dyers, 
called Orchell, or Canary weed, which is the Lichen 
Roccella of Linn. Sp. PI. 1622. 
As the objedt was of coniequence, the fociety was 
very defirous of being fully informed of the nature 
and appearance of this ufeful dye ; and therefore, 
feveral curious gentlemen of the fociety were de- 
fired, againft the next meeting, to bring fome fpe- 
cimens of true Orchell. Accordingly fome fpecimens 
were obtained from the Orchell dyeis in oouthwaik, 
and laid before the fociety. 
At the fame time Dr. Maningham, a member of 
that fociety, produced before the fociety a fpecimen, in 
a paper with Orchell wrote upon it, from Mr. Miller 
of Chelfea, likewife as the true Orchell: but, upon 
examining it, it proved to be the Coraluna neivo.te— 
nuori fragilionque internodia nedtente ot Sir x^.an;> 
Sloane’s Hiftory of Jamaica, Vol. I. Tab. 20. Fig. 4. 
Some difputes arifing on the. different appearance of 
the fpecimens, I took the liberty to inform the gen- 
tlemen prefent, that, having lately made fome expe- 
riments on Corallines, I believed that Mr. Miller’s 
fpecimen was a Coralline, or animal fubftance, and 
the Lichen Roccella, or Dyers Orchell, was a ve- 
getable ; and in order to convince the fociety of the 
/ Vol.LVII. Cxgg difference. 
