A scientific or technical society exists largely for the purpose of informing its members of the original work that is being done by each of them. When anyone has accomplished such work or has made such progress that he thinks an account of what he has done would be interesting, he sends a description of it to the proper committee, which decides whether it shall be read and discussed at a meeting, or published in the Proceedings, or both, or neither. The result depends on the size of the membership, on its activity, and on the value of its work. It may be that the programme committee has an embarrassment of riches from which to select, or that there is poverty instead. But in no case does it arrange a programme. The Physical Society, if that is its name and subject, does not decide that it will devote the meetings of the current season to a consideration of Radio-activity and assign to specified members the reading of papers on Radio-active springs, the character of Radium Emanation, and so on. If it did, it would doubtless get precisely the same results that we are complaining of in the case of the Woman's Club. A man whose specialty is thermodynamics might be told off to prepare a paper on Radio-active Elements in Rocks--a subject in which he is not interested. He could have nothing new nor original to say on the subject and his paper would be a mere compilation. It would not even be a good compilation, for his interest and his skill would lie wholly in another direction. The good results that the society does get are wholly dependent on the fact that each writer is full of new information that he desires, above all things, to communicate to his fellow-members.
In the preparation of such a paper, one needs, of course, to read, and often to read widely. Much of the reading will be done in connection with the work described, or even before it is begun. No one wishes to undertake an investigation that has already been made by someone else, and so the first thing that a competent investigator does is to survey his field and ascertain what others have accomplished in it. This task is by no means easy, for such information is often hidden in journals and transactions that are difficult to reach, and the published indexes of such material, though wonderfully advanced on the road toward perfection in the past twenty years, have yet far to travel before they reach it. Not only the writer's description of what he has done or ascertained, but the character of the work itself; the direction it takes--the inferences that he draws from it, will be controlled and coloured by what he reads of others' work. And even if he finds it easy to ascertain what has been done and to get at the published accounts and discussions of it, the mass may be so great that he has laid out for him a course of reading that may last many months.