236 NATURAL HISTORY 
the finger is removed ; placed on a hand tolerably warm, it keeps 
in perpetual motion to and from the hand like an animal flruggling 
for life y .” Now this is at firft fomewhat furprizing, but is indeed 
entirely owing to the ftrudture of thele bodies, the plants being io 
very thin that they yield to the perfpiration of the hand, the effluvia 
being of force fufficient to repel the leaves when they are near . 
Latifoiious N°. xlix. Fucus five Alga marina latifolia vulgatijfma , vel 
fea-wrack. G^ ercm mar in ma veficulos habens , the moft common broad-leaved 
fea-wrack \ 
N°. l. Fucus five Alga latifolia major dentata , broad-leaved in- 
dented fea-wrack b . 
N°. li. Fucus folio fingulari longiffimo lato in medio rugofo , the 
fea-belt c . 
N°. li i. Lichen marinus , the laver, fiauk, and by the Iriffl 
called Slukane \ We have it with the green leaf, called Oy- 
fter-green ; but the brown or auborn-coloured, is that which is 
prepared by being boiled to a jelly and ftewed, then left to fettle, 
and is eat as very nourifhing in Wales and elfewhere : this is alio 
found with us in plenty ; but never yet, as far as I can learn, ma- 
nufactured as in Wales. I have been informed, that the juice of 
laver pounded, taken three fpoonfuls in the morning falling for 
three weeks together, has been of great fervice in cancerous difor- 
ders ; and that the cure of a cancer in the bread; (with what foun- 
dation I cannot fay) has been attributed folely to it e . 
Anguftifoli- N°. LIU. Fucus anguftifolius folds dentatis , narrow-leaved fea- 
wrack and wrack with indented leaves, found here by Mr. Ray f . 
teretifoiious. N* J . liv. Fucus Kali geniculato fimilis , non tamen geniculatus , 
{mall-wrack, refembling glals-wort, found near the town of St. 
Ives s . 
N°. lv. Fucus angufiifolius veficulis longis filiquarum cemulis , nar- 
row-leaved wrack with long pod-like bladders 5 , near the Mount 
and Penzance. 
N°. lvi. Fucus folio tenuiffime divifo fiiliquatus , codded fea-wrack 
with finely cut leaves, found by Mr. Moyle of Bake in Cornwall, 
and Mr. Stephens, 1694/. 
N°. lvi 1. Fucus teretifolius fpongiofus parvus , fmall, round- 
leaved, Ipongy fea-wrack 1 . 
* Letter from the Reverend Mr. Griffith, F . 
of Pembroke College, Oxford, 1755. 
2 Ifinglafs, when fpread very thin, will yield 
in like manner to the force of perfpiration, ibid. 
a Ray, 2 d edit, page 2. 
b Ibid, page 3. 
c Ibid, page 6. 
* Ibid, page 10. 
' This relation came from a young lady who 
knew the perfon cured, and had the account of 
the cure from her own mouth. 
f Hift. page 71 ; edit. 2 d Synopf. page 3. 
s Ray, 2 d edit, page 4. 
h Ibid, page 5. 
1 Ibid. 
k Ibid, page 5. 
* Ibid, page 4. 
the 
