It has been the belief of certain kindly philosophers that if the one half of mankind knew how the other half lived, the two halves might be brought together in a family affection not now so observable in human relations. Probably if this knowledge were perfect, there would still be things, to bar the perfect brotherhood; and yet the knowledge itself is so interesting, if not so salutary as it has been imagined, that one can hardly refuse to impart it if one has it, and can reasonably hope, in the advantage of the ignorant, to find one’s excuse with the better informed.