The object of the present little volume is to reproduce in connected form, an account of the many interesting phenomena associated with liquid drops and globules. Much of the matter relates to experiments devised by the author during the past four years, descriptions of which have appeared in the _Proceedings of the Physical Society_; in the columns of _Nature_ and _Knowledge_; and elsewhere. The exhibition of these experiments at the conversazioni of the Royal Society and the Royal Institution, and in the author’s lectures, has evoked such interest as to suggest the present publication. It may be added that all the experiments described may be repeated by any intelligent reader at a trifling cost, no special manipulative skill being required. The context maintains the form of the lectures delivered on this subject by the author at various places, and the method of presentation is such as may be followed by those who have not received a training in this branch of science. It is hoped, in addition, that the book may prove of some service to teachers of science and others interested in the properties of liquids. A number of the illustrations used have appeared in the pages of _Knowledge_ in connexion with the author’s articles, and are here reproduced by courtesy of the Editor. Other drawings have been provided by Mr. W. Narbeth, to whom the author expresses his thanks. CHAS. R. DARLING. _City and Guilds Technical College,_ _Finsbury, 1914._ LIQUID DROPS AND GLOBULES LECTURE I *Introduction.*—In choosing a subject for a scientific discourse, it would be difficult to find anything more familiar than a drop of liquid. It might even appear, at first sight, that such a subject in itself would be quite inadequate to furnish sufficient material for extended observation. We shall find, however, that the closer study of a drop of liquid brings into view many interesting phenomena, and provides problems of great profundity. A drop of liquid is one of the commonest things in nature; yet it is one of the most wonderful.