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POPULAR SCIENCE MONTHLY.

his ancestors who worshiped in the cathedrals. For the general thinker, also, such works are of real use, as revealing more and more clearly that all progress in thought is the result of an evolution which is by no means to cease in our time.

Prof. Evans's work is thus valuable, not only to the student of art and literature, but to every one who wishes to penetrate the meanings of history in general. The writer of this article, having visited and studied nearly every cathedral and church of any importance from Throndhjem to Palermo, and from Dublin to Moscow, can vouch for the exactness of the statements made in this little book; and it should be added that the learned professor has attached to it a bibliography which, to any one who wishes to carry this fascinating subject still further, will prove most helpful.

TWO SCIENTIFIC CONGRESSES.

By J. MARK BALDWIN,

PROFESSOR OF PSYCHOLOGY, PRINCETON UNIVERSITY.

THE pursuit of science does not stop in summer, and those who go abroad for rest or recreation find that science pursues them. It is a very profitable form of science which is thus prosecuted in summer, however, and that in two respects: for, in learning science in a summer congress, one gets the things which the best men oftentimes save up for just this or that occasion, and then again one gets the men thrown in. This latter fact is really the redeeming feature of a scientific congress. It is appreciated, too; and the social side of the congress idea has had such development that it is a question whether the fatigue incident to the attendance upon the social functions does not sometimes enervate the scientist when he should be mentally most brave and sharp.

The International Congress of Experimental Psychology, of which I shall first speak, certainly touched the summit of social privilege, as a citizen in any monarchy would certainly agree, since certain of the members were given a dinner in Munich—the seat of the congress—by the reigning house in the person of Prince Ludwig Ferdinand of Bavaria, himself a man with a medical degree and the author of sundry medical monographs. This, together with the official reception by the city of Munich and the many other private and collective entertainments, will make this meeting memorable to those who had the good fortune to attend it. It was a chance, too, to meet almost every great—or less great—worker in the various departments of psychology in Germany.

The organization of an international congress for psychology