Soap Bubbles
and the Forces which Mould Them

THE FORCES WHICH MOULD THEM. II which I am about to direct your attention. You cannot then fail to be frequently re- minded of what you will hear and see in this room, and, what is perhaps most im- portant of all, many of the things I am going to show you are so simple that you will be able without any apparatus to repeat for yourselves the experiments which I have prepared, and this you will find more inter- esting and instructive than merely listening to me and watching what I do. There is one more thing I should like to explain, and that is why I am going to show experiments at all. You will at once answer because it would be so dreadfully dull if I didn’t. Perhaps it would. But that is not the only reason. I would remind you then that when we want to find out anything that we do not know, there are two ways of pro- ceeding. We may either ask somebody else who does know, or read what the most learned men have written about it, which is a very good plan if anybody happens to be able to answer our question; or else we may adopt the other plan, and by arranging an experiment, try for ourselves. An experiment is a question