While every one is sensible, that there must exist between characters, that are susceptible of all the fidelity and beauty of this sentiment, a certain adaptation of circumstances, and conformity of disposition, mind, development and temperament, I believe with St Pierre, that it is desirable, that there should be a certain contrast as well as much fitness. Constant assentation, the same opinions, tastes, tempers and views have been found by experience, not to generate the most permanent, and pleasant unions of the sort. The moral, as well as the physical appetite, would grow weary of perpetual uniformity and unvarying similarity, and requires the spice, afforded by the mixture of various ingredients of affectionate contrariety. Both the love and friendship, most likely to endure, spring up between the placid and piquant, the tranquil and energetic, the monotonously sweet tempered and the sensitive, whose irritability is held in check by good sense, kindness and self-control;--between the temperament, connected with blue eyes and fair hair, and that of the keen, deep black eye, and raven locks. ‘Soldiers,’ says St Pierre, ‘on long and distant expeditions, should be associated with ministers, lawyers with naturalists, and in general, the strongest contrasts of profession’--_all nature’s discord thus making all nature’s peace_. But I am perfectly aware, that there will be great danger of making fatal mistakes, in acting on this principle. I am confident, that is true in the abstract; but let sentimentalists beware of trenching too confidently on ground, where the limits between safety and ruin are so narrow, and difficult to discern. Doves of a different feather may pair happily, but not doves and vultures. There must be a certain compatibility not only of character, but of age, condition and circumstances, as we are broadly instructed in the fable of the frog thinking to wed with the ox. Any discussion of the details, touching the requisite circumstances of compatibility to form friendships with any chance of their being pleasant and permanent, as well as the obligations and duties involved by it, would require a volume, and would carry me utterly beyond my present purpose. Books are ample, if not interesting and just, in the information which they impart upon this subject. With my views of its obligations and duties in few words, I shall dismiss it.