Table Of ContentSE ee
a
SYSTEM
CHEMISTRY,
annette ese eeeeen aaa cera
PU RTC
SYSTEM nie
“PAB
oF
CUEMISTRY.
vchic!s we rotmed un the Vegetable
and Ammul Systems, aid which we to be the sabe
4 compounds.
svt the nugute of thar chemi & constuntion, diey dee
vcore consideration inthis value, are
exe jrculiae chars tes, by which they we connected
with each other, and ave diserumb.:*ow from the come
pourids which beloug ta the munetat Kinga m,
Warh regard re composition, the mineral subsanees
are cairymely varied ap to ie puinuptes of which they
are composed, but sungle as to ube mules in which these
are combine All he simple subsrnees are tobe found
inthe mine Kingdom, but they ate geoealwit g
binary combinations, oF, by the w:
pounds, others are formed, Th!
hand, which are formed in haat
toms, are mote uniform with regord to tha incipbn C7
WhLD they are compoved, but mote diversiGed in the
Tr" oF cHnMserty
fhich thee are combined ; théy consist only of
Pants, which are united scarcely ever in binary,
ternary, quaternary, ot even more-compli=«
nitly diver
seed; AN
ots may by said to consist of carbon,
al, of catbeny | prog
oxygen, H@%.goa, phosphor, und sulphur, Some of the
metals and earths, partieniatly iron, manganese, gull, b+
Jez, and Iifne, and the fixed alkalis, sre tikew ee obviined.
from vegutsble and animal bodies. But the quantities of
some of them urs perhaps
-hete ara seldom considerabt
Formed during the
ysis by which they ae of
and others may be regarded as forcign substances a
ci
dentally introduced. Lirw ond iron are of these p
ples the most cunston!, andl present ins largest proportiy:
From the ature uf the composigen of hie substan.
ces, arise the chemical prapertics by which rhey are cae
metetized, The compounds of the atineral Kingsto-:,
consir ing, in general, of two immediate principles, united
by a single affinity, have no tendency to suffer spor
neous changes; ot, when left to themselves, there i na
‘eaube to dissurb the uniformity of dwic mutual ufte-etion,
he relative force of ateract
united, can also be in some measure estimated, and
3 secant by which that attraction is malified
etermined Haze, By preventing theve principlesto each
sother und these cireumstances, we cat effect their oome
Sinationy'dr Form cqumotnds possessed of precisely the
same properties, | Werean analgee these compounds yh
in by which eheir pris.sples
ofeTRM OF CHEMISTRY. 8
qual facility, or, by a simple decomporizling separate’
their principles, so as to obtain them, isolated. "We can’
therefore ascertain with accuracy theis competion, hath
as to the nature and proportions of their cenetitnyrr pt ts,
an a3 to the modes in which thete afe capbennt ,
But the chemical constitution of the vegege's Yani-
mudd products is extremely different, and gives {Je to vasy
ditirent ckcmical characters. As they always consist of
three or more principles, whith have strong. enutual at«
aractions, rhe balance of these attractions, whence any
easily subverted ; the prin
ciples have a perpetual tendency to te-att ou each other,
and enter into new combinat:ons,—a tendency renééred
Aicheal wy the shghtest alterabon of circumstances.
TTenve arises che facility of decomposition which is cbae
acteristic of these bodies : they ate tiuble to spontaneous
pittuular compound exists,
“Thaugess fermentation and puir.Fact'on > they ave xeadily
acted on by other agent, as by w Wer or atmospheric air 5
and they ate totally changed by an imerease of temperae
ture. As their principles, too, have mutual affinities of
nearly the same force, they never escape from 4 come
bmauon pure and uncombined, but unite with each other,
Forming a coiphcated analysis ; anil as their composition,
woth regard to the ultimate ptinciptes, is much alike, the
, in the differont individual sube
stanees, are catremsly similas, Aad, Instly, a¢ we ate
ineapable of bal nung the attractions of the septral ptléar
cipks 6f wlach chey ate formed, or of placing these psin-
ciples under the cieumstaneys umder which they were
ropght into union io the veescls of the ankmat or plnut,
Ag
products of thi, analy.
