paper, or on metallic paper are very
durable. Dr. Barth wrote his numerous observations entirely in
Indian-ink. He kept a tiny saucer in his pocket, rubbed with the ink;
when he wanted to use it, he rubbed it up with his wetted finger-tip, or
resupplied it with fresh ink, and filled his pen and wrote. Captain
Burton wrote very much in the dark, when lying awake at night; he used a
board with prominent lines of wood, such as is adopted by the blind. It
is very important that what is written should be intelligible to a
stranger after a long lapse of time. A traveller may die, and his
uncompleted work perish with him; or he may return, and years will pass
by, and suddenly some observations he had made will be called in
question.

Professor J. Forbes says:--"The practice which I have long adopted is
this:--to carry a memorandum-book with Harwood's prepared paper" (in this
point of detail I do not concur; see next paragraph) "and metallic
pencil, in which notes and observations and slight sketches of every
description, are made on the spot, and in the exact order in which they
occur. These notes are almost ineffaceable, and are preserved for
reference. They are then extended, as far as possible, every evening with
pen and ink, in a suitable book, in the form of a journal; from which,
finally, they may be extracted and modified for any ultimate purpose. The
speedy extension of memoranda has several great advantages: it secures a
deliberate revision of observations, whether of instruments or of nature,
whilst further explanation may be sought, and very often whilst
ambiguities or contradictions admit of removal by a fresh appeal to
facts. By this precaution, too, the risk of losing all the fruits of some
weeks of labour, by the loss of a pocket-book, may be avoided."

It has occurred to me, frequently, to be consulted about the best was of
keeping MSS. Captain Blakiston, who surveyed the northern part of the
Rocky Mountains, and subsequently received the medal of the Royal
Geographical Society, for his exploration and admirable map of the
Yang-tse-Kiang, in China, paid great attention to the subject: he was
fully in possession of all I had to say on the matter; and I gladly quote
the method he adopted in North America, with slight modifications,
according to the results of his experience, and with a few trivial
additions of my own. For the purposes of memoranda and mapping data, he
uses three sets of books, which can be order