ch have been addressed to me privately by
members of my audiences have clearly indicated that there is ample scope
for writers in satisfying a widespread desire for fuller and clearer
information upon such subjects. I have observed that particular interest
is taken in the planet Mars and also in the moon, but ordinary persons
usually find astronomical text-books too technical and too difficult to
master; whilst, as regards Mars, the information they contain is
generally meagre and sometimes not up-to-date.

Scientific readers are already provided for: and it occurred to me that
it would be much more useful and appeal to a more numerous class if,
instead of writing a book on the usual lines, I wrote a narrative of
events which might be supposed to occur in the course of an actual
voyage to Mars; and describing what might be seen on the planet during a
short visit.

This is the genesis of the story; and, in carrying out my programme, I
have endeavoured to convey by means of natural incidents and
conversations between the characters portrayed, the most recent and
reliable scientific information respecting the moon and Mars; together
with other astronomical information: stating it in an interesting form,
and in concise, clear, and understandable language.

Every endeavour has been made to ensure that this scientific information
shall be thoroughly accurate, so that in this respect the book may be
referred to with as much confidence as any ordinary textbook.

Apart from my own studies and work, all these facts have been carefully
verified by reference, as regards the moon, to the works of such
well-known authorities as Neison, Elger, Proctor, Sir Robert Ball, &c.,
whilst, with respect to Mars, the works of Professor Lowell, Flammarion,
Professor Langley, and other writers, as well as practical papers by
other actual observers of the planet, have been studied.

The personal opinions expressed are entirely my own, and the technical
writers above mentioned are in no way responsible for them. I do not,
however, expect my readers to accept all my views, as they relate to
matters in which there is ample room for differences of opinion.

The reader will, of course, understand that whilst the astronomical
information is, in all cases, scientific fact according to our present
knowledge, the story itself--as well as the attempt to describe the
physical and social conditions on Mars--is purely imaginative. It is
not, however, mer