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218 Hints for the Formation of 
with a pencil of tin folder, which it is not neceffary always 
to cut, and the writing of which is not fo eafily effaced as 
that of plumbago. In this portfolio the traveller mutt write 
out, on the fpot, the fketch of his journal, and infert fach 
obfervations as occur to him; but he mult take the trouble 
to tranfcribe thefe notes at more length, preferving the pri- 
mifive notes, which will always retain a character of truth, 
and for that reafon people are fond of recurring to them. 
7. Some quires of brown paper, a few fheets of which 
may be carried in the pocket for wrapping up on the fpot 
fpecimens of the flones you collect, the characters of which 
ought to be marked on the cover. You may afterwards pack 
them with hay into a bag deftined for that purpofe, until you 
have a fufficient quantity to form a box, which you may fend 
home by the public carriages wherever you find an oportu- 
nity; but, as it is fatiguing for the traveller to load his poc- 
kets during the time of bis excurfions, and as the guides often 
Jofe them on purpofe in order to get rid of them, I have be- 
hind my faddle two leathern bags, into which I put them till 
I come to fome halting-place, where I have time to pack 
them with hay mto a bag. M. Beffon recommends to thofe 
who undertake fea voyages to write with China ink the cha- 
racters which ought to accompany minerals in long paflages, 
becaufe common ink may be effaced by accidents. 
8. A blow-pipe, with its apparatus. As I make much 
ufe of this inftrament, which at length fatigues me, though 
I can blow with my cheeks without exercifing my breaft, I 
caufed to be confiruéted a pair of portable double bellows, 
the fides of which contain each fixty-two fquare inches. 
Thefe bellows can be fufpended from the edve of a table; 
and I put them in motion by pyeffing together, between my 
knees, the two handles, which afterwards feparate by the 
aétion of the fpring. This apparatus may be eafily ¢arried, 
and is very convenient. 
g. A graduated femicirele traced out on a copper-plate of 
a form exactly rectangular, with a plummet fufpended from, 
the centre of the femicircle. This femicircle is the moft 
convenient infirument for meafuring the inclination of ftrata, 
of veins and declivities ; and it may always be carried in a 
pocket .of the portfolio. 
Io. A 
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