The answers received (and they were not many) ranged from $150 per annum up to $5 per week ($260 per annum), In the work we have taken $200 as a fair mean. But, even upon the lowest estimate the sum is so vast, that it really matters very little which valuation is adopted. If any reader thinks that $200 per annum is too high an estimate let him boldly strike off 25 per cent., and page 30 the balance will still be found amply large enough to justify all our conclusions.

For our American statistics we are chiefly indebted to that valuable compilation, "The American Almanack for 1879," by Mr. A. R. Spofford, to which we beg to refer those who may doubt the accuracy of our figures.