gravitation (as if gravitation too were a 
{ubftance) owe their movement (or may 
owe it) mot to a projectile, but inherent, 
Jjorce*.”” It is evident, that a projedile 
force being, as fuch, foreigy to matter 
can be only mind: it is evident, that an 
inherent force of movement implies a /pan- 
taneous energy in matter; but if matter, 
as he wifhes, and as his hypothefis re- 
quires him to fuppofe, be living and fen- 
tient, and have a fpontaneous energy, 
what property does: it wart, by the pri- 
vation of which to be diftinguithed from 
mind ; or, what property as it which is 
mot in mind? Shall it be faid, figure or 
folidity? But, if mind occupies body, 
and is circumfcribed by fpace, it is cither 
a mere power of organization, or is itfelf 
figurable fubftance folidly extended.” The 
propertics thus afcribed to matter tend 
therefore to confound it with wi#zd, under 
ene common definition, name and nature. 
But this living, fentient, {pontaneoufly- 
ative matter cannot be what any advo- 
cate for matter, as diftinguifhed from 
mind, pofibly can admit. All general 
laws which apply to it, as moveable by a 
certain impulie, in a certain direction, ac- 
cording to its quantity, and the quantity 
and velocity of the impelling matter,would 
be perpetually contradicted by its fenfe, 
volition, and aétive energy. A bullet 
might choofé a line different from that pre- 
{cribed by thefe laws, and its force would 
be modified by the refiitance of volition, 
which never could be calcuiated by created 
intelligence, compounded with the mere 
renfiance of matter; and, if matter be ef- 
fentially inert; impercioient, and dead, it 
is better at once to fay it 1s.a mere name, 
exorefiive of a certain order, ferics,, and 
combination of feniibie phenomena. We 
may take the name, hypothetically, as the 
-¢xprefion of an unknown power; but 
when, in the folution of our problem, we 
find that this power is a power of mind, 
we reject the hypothetical term in our ul- 
timate equation, and tubRitute serd, which 
as the true expreffion of its value afcer- 
tained, in its room. 
But, if wud mean fpirit (chat is, if it 
do net mean matter, or arefult.of matier), 
it is faid, that ‘* zt zs mot true that. we 
cannot doubt of its cxiftence.’” Admitted; 
nor had I fiated otnerwife; for we have 
to prove, whether mind be inaterial, im- 
material, or mixt. “But we cannot doubt 
whether mind exifts; that is, whether in- 
teliect, perception and active power, exifts. 
-Ot this we. have. experience, and diregt 
mi er 
* 1,325, 0. 
Manufacture of Mottled Scap. 
[Jaly 1, 
neceffary confcioufnefs. .Whether the ef- 
fence of the mind be material or immate- 
rial, is the thing to be difcovered. Of 
matter we can doubt, but of mind we 
cannot. If, then, matter, of which we 
can at leaft doubt, be required by one hy- 
pothefis, and mind alone be required by 
the other; the hypothefis which affumes 
nothing of which we can doubt, and thus 
accounts for all the phenomena, is philo- 
fophically preferable ; and the other fhould 
be rejected. Your’s, &c. : 
C.L. 
=e 
To the Editor of the Monthly Magazine. 
SIR, gars: 
N reply to the enquiry of T. M. of 
Edinburgh, inferted in your Maga- 
zine for May lafi, who wifhes to be in~ 
formed what ingredient or procefs is made 
ufe of or purfued in the manufactory of 
hard foap, fo as to give that marbly or 
mottled appearance which it affumes : 
Though I cannot give a full anfwer to 
his enquiries, I can with confidence inform 
him, that indigo is the material employed ; 
and if he will give the following direction 
a trial, I think it bids fair to anfwer his 
purpofe. Let the indigo be powdered and 
fifted, and then boil it in a fufficient quan- 
tity of weak foap-lees, till it is complete- 
ly diffolved ; let it ftand till nearly milk- 
warm, and then pour in more or lefs of 
the folution, juft as the mottles are defired 
to be either pale or high-coloured ; this is 
to be done a few minutes before the foap 
is removed from the boilers to be put into 
the frames; the ftirring fhould continue 
till the foluticn and foap are mingled to- 
gether., An exverimental chemift, from 
thefe hints, will be at no lofs to readily 
afcertain, from a few fimple trials, all that 
is neceffary on the fubjeét.* 
I would be thankful toT.M. or to any of 
yourCorre{pondents, if they would, through 
the medium of your intelligenc Maga- 
f) 
* The, large cakes of marbled or 
freaked foap, variegated with ftripes of 
lue and red, and which is chiefly imported 
into this country from Spain and France, 
called Caftile and Venice foap in commerce, 
is mottled with a metallic fubftance, which 
chemiftry may dete& by a folution of phlo- 
giftic alkali being poured into a decompofed 
folution of the foap in water; the metallic 
oxygenated powder precipitates. It would be 
a national benefit 1f fome public-fpirited man 
would eftablifh a manufatory of this article 
in Great Britain: he would be amply remu- 
herated 3 for the duty amounts to as much 
nearly as the prime coft, 
inform 
