It is needless to dwell on the objection made to the rising hopefulness in regard to the study of Man, and the mysteries of his nature. Between the multitude who have still no notion of any alternative supposition to that of possession or inspiration by spirits, or, at least, intercourse with such beings, and others who fear "Materialism" if too close an attention is paid to the interaction of the mind and the nerves, and those who always shrink from new notions in matters so interesting, and those who fear that religion may be implicated in any slight shown to angel or devil, and those who will not see or hear any evidence whatever which lies in a direction opposite to their prejudices, we are not likely to get on too fast. But neither can the injury lapse under neglect. The spectacle presented now is of the same three sorts of people that appear in all satires, in all literatures, since the pursuit of truth in any mode or direction became a recognized object anywhere and under any conditions. Leaving out of view the multitude who are irrelevant to the case, from having no knowledge, and being therefore incapable of an opinion, there is the large company of the superficial and light-minded, who are always injuring the honor and beauty of truth by the levity, the impertinence, the absurdity of the enthusiasm they pretend, and the nonsense they talk about "some new thing." No period of society has been more familiar with that class and its mischief-making than our own. There is the other large class of the cotemporaries of any discovery or special advance, who, when they can absent themselves from the scene no longer, look and listen, and bend all their efforts to hold their ground of life-long opinion, usually succeeding so far as to escape any direct admission that more is known than when they were born. These are no ultimate hindrance. When Harvey died, no physician in Europe above the age of forty believed in the circulation of the blood; but the truth was perfectly safe; and so it will be with the case of the psychological relations of the nervous system when the present course of investigation has sustained a clearer verification and further advance. On this point we have the sayings of two truth-seekers, wise in quality of intellect, impartial and dispassionate in temper, and fearless in the pursuit of their aims. The late Prince Consort is vividly remembered for the characteristic saying which spread rapidly over the country, that he could not understand the conduct of the medical profession in England in leaving the phenomena of mesmerism to the observation of unqualified persons, instead of undertaking an inquiry which was certainly their proper business, in proportion as they professed to pursue _science_. The other authority we refer to is the late Mr. Hallam. A letter of his lies before us from which we quote a passage, familiar in its substance, doubtless, to his personal friends, to whom he always avowed the view which it presents, and well worthy of note to such readers as may not be aware of the observation and thought he devoted to the phenomena of mesmerism during the last quarter-century of his long life. "It appears to me probable that the various phenomena of mesmerism, together with others, independent of mesmerism properly so called, which have lately [the date is 1844] been brought to light, are fragments of some general law of nature which we are not yet able to deduce from them, merely because they are destitute of visible connection--the links being hitherto wanting which are to display the entire harmony of effects proceeding from a single cause."