In quitting, for the present, the subject of scientific societies, we must advert to a consequence of the increased number of candidates for scientific distinction of late years; of which increase the number of these societies may be regarded as an exponent. This increase, although on the whole both a cause and a consequence of the advancement of science, yet has in some respects lowered the high character of her cultivators by the competition it has necessarily engendered. Books tell us that the cultivation of science must elevate and expand the mind, by keeping it apart from the jangling of worldly interests. This dogma has its false as well as its true side, more especially when in this, as in every other field of human activity, the number of competitors is rapidly increasing; great watchfulness is requisite to resist temptations which beset the aspirant to success on this arena, more perhaps than in any other. The difficulty which the most honest find to avoid treading in the footsteps of others--the different aspect in which the same phenomena present themselves to different minds--the unwillingness which the mind experiences in renouncing published but erroneous opinions--are points of human weakness which, not to mislead, must be watched with assiduous care. Again, the ease with which plagiarism is committed from the number of roads by which the same point may be reached, is a great temptation to the waverer, and a great trial of temper to the victim. The disputants on the arenæ of law, politics, or other pursuits, the ostensible aim of which is worldly aggrandizement, however animated in debate, unsparing in satire, reckless in their invective and recrimination, seldom fail in their private intercourse to throw off the armour of professional antagonism, and to extend to each other the ungloved hand of social cordiality. On the other hand, it is too frequent a spectacle in scientific circles to behold a careful wording of public controversy, a gentle, apologetic phraseology, a correspondence never going beyond the "retort courteous," or "quip modest," while there exists an under-current of the bitterest personal jealousy, the outward philosopher being strangely at variance with the inward man.