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The five following are the principal circumstances which, so far

as I have been able to observe, make up for a small pecuniary

gain in some employments, and counterbalance a great one in

others. First, the agreeableness or disagreeableness of the

employments themselves; secondly, the easiness and cheapness, or

the difficulty and expense of learning them; thirdly, the

constancy or inconstancy of employment in them; fourthly, the

small or great trust which must be reposed in those who exercise

them; and, fifthly, the probability or improbability of success

in them.