Three distinct elements are included in this general statement, viz.: (1) The cultivation of personal intercourse or acquaintance among the workers in science in this country; (2) the encouragement, extension, and proper direction of scientific research; (3) the gaining of popular recognition and good will for the results of scientific work. These objects may be conveniently summarized as (1) social, (2) scientific, (3) practical.

There is nothing in the original paragraph to indicate whether the elements of this threefold division were counted of equal value, or whether they were arranged in either an ascending or descending scale of importance, but from the fact that in the development and expansion of the association during the last fifty years nothing has been added to and nothing subtracted from this general statement, while in many other divisions of the constitution large and sometimes radical changes have been adopted, it seems safe to conclude that the present members of the association see its work and office in very much the same light as its founders did.

But, while sailing under the old colors and apparently by the old charts, it is quite possible that the association is, insensibly to itself, undergoing modification more or less important. Such an experience is unavoidable in all human institutions, at least in those that retain their vitality in state, society, or church.

The fifty years that cover the life of the association are unquestionably the most important, so far as the growth of science is concerned, in the history of the race. Within this period every science has been recast and rewritten, and divisions and subdivisions of the old units have gone forward and are still in progress. Of every one of these sciences the boundaries have been so enormously extended that even the dream of universal knowledge on the part of any man has gone by, never to return. Leibnitz, it has been said, was the last of the intellectual giants of old who mastered all that was knowable in his day. Alexander von Humboldt could almost claim the same for the knowledge of Nature that was attainable in the first quarter of our century. But since the application of the compound microscope to the study of Nature and the subdivisions of the sciences that have resulted therefrom, and especially since the extension of the method of science to all the branches of anthropology, as language, history, institutions, the task of mastering all that is known is seen to be altogether too great for finite powers and span-long lives.

It might well be, therefore, in view of the amazing changes that have taken place in the entire field covered by the association, that it should have outgrown the aims and ambitions of its early days. The fact that it continues to use the identical statement of its objects with which it began its work, while it does not definitely settle the question, affords at least presumptive evidence that no such change has taken place.

How, then, do the objects originally recognized by the association as its raison d'être correspond to the needs of our own time?

1. Is the social feature of the association, to which the first place was assigned by the founders, whether by design or not, worthy of preservation by us? In other words, is it as important "to promote intercourse between those who are cultivating science in America" at the close of the nineteenth century as it was at the middle of the century—the need that was responded to by the formation of the American Association for the Advancement of Science? While revolutionary changes have taken place in the country at large during this period in modes of travel, facilities for acquiring education, and the diffusion of intelligence, it would be hard to show why the need in this field should be in any respect less urgent. There is a far larger number of people who are cultivating science, and there are many more branches of science to be cultivated.

What particular service is to be expected from such intercourse as the association seeks to provide? The gathering of the workers in the diverse fields of science into a single organization has a tendency to unify them. They find that a common spirit animates them, that they all make use of essentially the same method of research or inquiry, and that the results which they reach all have a common note of certainty, being herewith differentiated from other and older views on the same subjects, as knowledge differs from opinion. They are thus led to see more clearly than they could otherwise see the unity of the universe, that knowledge is one, and that each science is but a facet cut on the crystal sphere of natural truth, touching other facets at many points, and by no means independent, but supported by the integrity of the sphere.

Such a gathering tends to an increase of mutual respect and confidence on the part of all engaged in scientific work. It tends to discourage the narrow conceit of the specialist, who, if left entirely to his own tastes, comes to think that his own facet is the only one that deserves to be regarded, and practically to ignore its relation to the sphere of which it constitutes an essential though a minor part.

Such an association tends toward making specialists intelligible to each other. In other words, it puts a premium on the art of popularizing science, for when the specialist makes himself intelligible to his brethren in their widely separated fields he makes himself intelligible to all educated men, whether especially trained in science or not.