is to establish or prove the existence of a simultaneity in the
Northern and Southern Lights.

If you have yet obtained those books that I told you some time ago
to get, you will find some elementary information on the subject in
them, particularly in Lardner's Museum of Science and Art.

I suppose I shall hear by the next mail whether you have been able
to obtain for me Savage's Practical Astronomy. I want to trouble
you with another commission of the same kind, namely, to find out
whether there is a translation from the German into English of
Professor Carl Kreil's Introduction to Magnetic Observations, 2nd
edition, Vienna, 1858. I fear you will have some trouble in getting
this book for me, but it is of great importance that I should have
it if possible. It may not be translated yet, but it certainly will
be before long. Whenever you get any catalogues of scientific books
from the publishers in London, you might send them to me in a
letter; or if they are too bulky, you have only to put a strip of
paper round, and send it as a book, without letter or writing. The
postage is sixpence for four ounces, and threepence for every two
ounces more, up to three pounds, which is the greatest weight that
may be sent in one parcel; its dimensions must not exceed two feet
in any direction.

They have just succeeded in raising the two thousand pounds here,
by subscription, that was wanted towards an exploration fund, for
fitting out an expedition, that will probably start for the
interior of our continent next March. Camels have been sent for, to
be used in places where horses cannot go. You would be astonished
at the number of applications that are being made by people anxious