m 
Hints for the Formation of 
a line to a line and a half, to detaeli small crystals, or 
other objects of small bulk ; the other, seven or eight 
lines. 
2 . To try the hardness of fossils, a piece of steel to 
strike fire will be necessary ; also a triangular file, pretty 
fine, and a strong bodkin of tempered steel. 
3. Nitrous acid, with M. Be Morveau’s boxes of re- 
agents. 
3. A. An artificial magnet, in a case, with a steel 
pivot on which it can be placed, to try the magnetism of 
fossils. 
A magnifying glass of three inches focus, in order 
to enable the observer to form a general idea of any fos- 
sil : .another, of an inch focus, to examine its separated 
parts; and one of five or six lines for closer examination. 
These three magnifiers must be always in the traveller’s 
pocket, or ready at hand : but, besides these, he must 
have, for his closet at home, a microscope furnished with 
a micrometer. 
5. Telescopes, to observe inaccessible mines and dis- 
tant mountains. 
6. A pocket portfolio, with prepared paper for writing 
on with a pencil of tin solder, which it is not necessary 
always to cut, and the writing of which is not so easily 
effaced as that of plumbago. In this portfolio the travel- 
ler must write out, on the spot, the sketch of his journal, 
and insert such observations as occur to him; but he must 
take the trouble to transcribe these notes at more length, 
preserving the primitive notes, which will always retain 
a character of truth, and for that reason people are fond of 
recurring to them. 
7. Some quires of brown paper, a few sheets of which 
may be carried in the pocket for wrapping up on the spot 
specimens of the stones you collect, the characters of which 
ought to be marked on the cover. You may afterwards 
