HEA 
ida fiteal Minorca; but its fymptoms are by ‘nd means {6 
violent and diftrefling as thofe of the Lichen tropicus, Dr. 
Cleghorn confiders t is difeafe as the/udamina of the Romans, 
d the ideva, a. ippocrates. . Willan, how- 
ver, obferves that * "the term Hidroa‘is afually applied by 
the Greek phyficians to an eruption of miliary puitules :”’ 
and thinks that the more appipnend terms ufed by them are 
lichen, eczema; or eczefma a of the Arabians. 
comprizes the nettle-rath, pruti o, and fome other — 
ry onthe Dif. of Barbadoe 
—Cleghorn on ac: Dif. 
of Minorca.—See alfo Dr. Willan’s learned work on Cuta- 
_neous Difeafes, each contains a defcription of the difeafe 
gical phenomen a 
this fubject particularly in charge to the travelling obfervers 
~ whom he’ employed, od of — p- 103. Res 
peated obfervations hav r fhewn, that the —- 
of different minerals, at “tmilet ces x ei “tend affect 
Mt, Wemer - “0 
' tranflation. of phage 
“y a likewife found that what: = er ‘hid ‘of the nes 
heat obfervable in mines of =~ is sn void of found- 
ation."?. 
this is to bet ibe ioe eft hea 
Heat of Vegetables, in a 6 eect Phyfiology, is evinced 
meltin 
t {now when in contact teil 
and vegeta- 
ry plant, is evident to the flighteit* pSdevtastians! 
It is not way a neceflary imulus to its conftitution, for the 
total deprivation is fatal to 
A determinate portion of heat is eflen- 
is vemecably —— 
ai nt climates. ‘The v 
pics are as effectually killed yi a ga zing d d as 
all plants are by a a heat, and — nearly the fame 
os et vegetables cold ch pei on 
the contrary, 
cold without i ara 
= vital really is —<—-* 
Sa Aerie : 
in trees whofe buds are formed to fuf- 
even of a Lapland climate, but fome 
» even in our own, are liable to” fuffer from a teed 
ght recu of after their buds ha 
nce ibe to burft. Hence the difficulty. of Seis 
. ie fhrubs, Ee r inftance, in chmates 
milder than 
= say be y be. accelerated by ati 
he ee gw of ma ps my be ec 
that plants acquire habits with regard to to heat which 
cattle, oc 
i i 
Hy EA 
are a decifive proof of their vitality. A peach-tree that has _ 
been forced, if expofed to the open air in the following fea- 
fon, éetpaside its buds prematurely to inevitable is saa 
In general, however, plants which have been forced requi 
a flronger degree of heat than is natural to them, in order - 
continue in health. The effe& of heat upon them is in pro- 
portion to the degree of cold to which they have been ac~ 
cuftomed. See CincuLarion ap. 
If it be fo difficult to ‘acco for the. apontaneos pro- 
duétion of heat in animal bodies, as all ph hobogihs, Ladi 
of both 
d, i ‘ 
Lamarck fays, in 2 Flore P 2 rentiits ve 
perature as the furrounding bodies. 
fora few hours.’’ This fame author pt Ae this dnote 
non in the white-veined variety of the plant in queftion, 
ittle differ our comm 
Arum. | 
fheath was a about 
and that it was perceptible from three or 
afternoon till midn a es Its greatett GA Reau- 
mur’s feale above the heat of the senior which at the 
om a his obfervation was about 14 0r 15 of that thermo- 
' me 
HEATH, in Botany. See Erica. . 
- Hearn, Berry-bearing. See EMpeTruM. 
Heatu, Mountain. See ap gy ’ 
Hearn, Low-pine. See Cor 
Hearu-cock, in ef sa thea See Grows and TrETRAO. 
. Heatn-peafe, in Botany. See Orosvs. 
HeaTtuH, in als ie a ee platy 
met with on extenfive tra poor com 
land. It is conftantly found prensa on fa deketihiogh 
of land as have an be gucifiesent quality. il » ACH 
the peed a Invernefs, is that 
; fand 
pia gre! 
moor 
wth vigorous. 
on fis fuperficial parts of grounds, where it Pa met with in 
abundance, but the layer in thefe cafes is thin; 
. 
the hase of its appearance. i in 
ile the warm valley on the one hand, 
orthern , 
which enjoys the fertilizing Sane of a placid flream, ‘ant ; 
of a powerful fun, is too ric 
cares 
a foil for this plant; the 
of the mountain is, on the other pane, too 
ee on oO 
all — and ¢ 
occupies thefe 
up the Mis while the kc and the vallies below are apa poad 
for peg corn. 
- 
. 
