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Rh and testing the various views and suggestions that had been proposed, and arriving at new and important conclusions in regard to the causes of which he was in search. He then subjected these conclusions to elaborate experimental verification by newly-devised apparatus, and original researches in the Royal Institution, with the attainment of results which will probably take their permanent place among the principles of acoustical science. At any rate, the subject, with its accumulated difficulties, had never before received so efficient a sifting and overhauling; and it was this that Prof. Tyndall meant, and had a right to mean, by the phrase "systematic inquiry into causes," in which he characterized his work. The writer in the Tribune can entertain his own views as to what that phrase signifies in dealing with the phenomena of Nature, but Prof. Tyndall will be perfectly easy in leaving this matter to the judgment of scientific men.

meeting of the American Association for the Advancement of Science, which began August 23d and lasted a week, has been unusually successful. There was a strong attendance of members, and a greater number than at any previous session of foreigners distinguished in science. A large number of papers were contributed to the proceedings, several of them important and of marked originality. Prof. Rogers presided with characteristic dignity and grace, and the retiring president, Prof, Hilgard, gave an instructive address, devoted mainly to his own department of study, and giving a sketch of the progress of the scientific measurements and mapping of the earth.

And the meeting was a success socially as well as scientifically. The citizens of Buffalo extended their hospitality in the most liberal manner to members and visitors, and the local committee made efficient arrangements for the accommodation of all who desired it. There were the usual receptions, which were largely attended and much enjoyed. It is given to but few places to favor their guests with so pleasant a treat as a day at Niagara Falls.

The Buffalo people owe their best thanks to Mr. Secretary Grote, of their young Academy of Sciences, for his efficient agency in securing the meeting to their town on this memorable year, as Philadelphia was a powerful rival for the honor. It is through this little scientific society, which has had to struggle on with insufficient means, sustained by a few who were heartily interested, that the citizens of Buffalo have been roused to invite the convention and to extend to its members so cordial a welcome. We hope that the stimulus thus given to the public interest in scientific subjects will bear permanent fruit and result in establishing the Buffalo Academy upon a liberal and permanent foundation.

But, while Buffalo has done its duty admirably toward the Association, has the Association in turn done its duty to Buffalo? Is duty in such a case a wholly one-sided thing, or are men of science such lions that they pay off their hosts by their bare presence? We do not suppose that the hospitable Buffalonians had an eye to what was to be got back from their guests, but obligations were nevertheless incurred, and it is proper to inquire how they were met. The citizens of that town, having no experience, did as those of other towns always do on these occasions—promised themselves great pleasure in attending the sessions of the Association. They drifted in freely at the opening meetings, but, after being peppered for an hour with unintelligible terms, they generally withdrew in a quiet way, and with their ardor cooled for discussions that could but little interest people at large.