But instead of its being true that the scientific work of the country has outgrown the need of the association, is it not rather true that we are in far more urgent need of its unifying agency than even the founders were fifty years ago? We have all the divisions of science that were then recognized, and half as many more. Physics and chemistry could then be classed in one section without offense, and zoölogy and botany were assigned without protest to a single heading. Now, not only does every science demand recognition by and of itself, but all are represented by separate societies as well--as the Mathematical Society, the Chemical Society, the Geological Society, etc. These societies hold meetings, publish bulletins, reports, and sometimes monthly journals, and, in short, aim to cover the entire field for the branches which they represent. They are generally affiliated with the association, and it is becoming usual for them to hold joint summer meetings of society and section. Their annual meetings are held in the winter, and, as their membership is more select than that of the association, standing as it does in all cases for published or recognized work already in evidence, these winter meetings are coming to be preferred for the presentation of technical papers. Those who read them feel sure of "fit audience, though few." These societies are all vigorous and successful. They obviously meet a "felt want" on the part of American science, but just what their effect will be upon the association remains to be determined. Certainly, with these centrifugal tendencies in growing activity, this is not the time for the attraction of our one centripetal force to be relaxed. More than ever do we need such a unifying agency as the association was designed to supply. Some _modus vivendi_ between section and society will doubtless be found. Perhaps the more abstract and technical papers will be reserved for the winter meetings, while those dealing with the larger phases, and especially those pertaining to the philosophy of the subjects discussed, will find their places in the joint meetings of the summer. It would be well if the association meetings of whatever character could be made memorable by the announcement of important discoveries made during the preceding year. The custom of holding back such announcements is said to obtain in the transatlantic national associations, and notably in the British Association, which is the mother of all the rest. Those who were present at the Boston meeting of the American Association will remember the enthusiasm created there by the announcement of the discovery of a new element--etherion. If later discussions have thrown doubt upon the discovery of a new element, the alternative explanation suggested of the facts proves scarcely less interesting or important than the original claim.