LXIV. On the interaction of natural forces

The following article is a translation of a popular lecture, but it will, I doubt not, be studied with interest by many of the readers of this Journal. I once had thoughts of presenting the lecture in a condensed form, omitting allusions, which though proper and necessary in a spoken discourse, might not appear so in a strictly scientific article. On reflection, however, I think it better to let the accomplished author state, in his own fashion, the important question which he has contributed so much to expand and elucidate.—J. T.