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of which it forms a part, and its earlier and later relationships are renewed, because the memory is by it directed to that portion of experience in which it has played a part. Ideas are thus interlocked in memory, and return to the mind surrounded more or less completely with their adjuncts, their companions in previous knowledge. A second ground of association is that of the deductive dependence of ideas. The logical power of the mind on the presence of a part expounds it by reference to the whole; or on the presence of a whole unfolds it in its parts.

These two forms of association correspond to the two methods of acquiring knowledge. Observation, induction present objects as physical wholes, and the memory so retains them; analysis, deduction unfold ideas, and the memory and the logical faculties combine to repeat, on fit occasions) these processes. The cement of ideas is the living forces that use them, not a dead adhesiveness belonging to them as ideas, or dependent on the nervous conditions of their presence. It is not a reverberation of tissues, but of thoughts, to which attention should be directed.

We see at once, then, that the power of the mind over its trains of ideas is greater than many are willing to admit. Take any one moment, with the tendencies and memories of the past fixed, the circumstances of the present established, the current of the desires strong and declared, and thoughts and conceptions may seem rather to sweep independently through the mind, a deep, uncontrollable current, than to be called forth and used by it. Take, however, a longer period, let the mind desire to assume control, and this appearance of helplessness will pass away, and our impressions will be reversed. Times are set apart to definite inquiries. The passing hours bring each its suggestion of its part of the plan. The memory is more and more stored with material suitable to the investigation