A scientific expedition may be said to have two histories. The one treats of the special object of the expedition, the other of the personal adventures of those concerned in it. It is only the former which finds permanent record in the Transactions of scientific societies: the other too often remains unwritten.

For many reasons I think this is a matter of regret. Mere details of observations are never looked at, except by a very limited number of specialists; to the general public such details are meaningless as well as inaccessible; whilst the ordinary student usually accepts the result merely as he finds it quoted in some standard work or text-book.

It is not because popular accounts of such expeditions do not interest a sufficient circle of readers that they have not been more frequently written, but rather, I think, because the faculties of original research and popular exposition are seldom united in the same individual. Besides this, I have found in my own experience, that on such expeditions there is so much actual work to be done, and the hours are so completely filled with it, that there is neither time nor inclination to write a diary. Thus, before the story can be committed to writing, it has lost its crispness—the interest has faded, and, from treacherous memory, incident is wanting to complete the narrative.