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In the same class must be ranked, some both of the gravest and

most important, and some of the most frivolous professions;

churchmen, lawyers, physicians, men of letters of all kinds;

players, buffoons, musicians, opera-singers, opera-dancers, etc.

The labour of the meanest of these has a certain value, regulated

by the very same principles which regulate that of every other

sort of labour; and that of the noblest and most useful, produces

nothing which could afterwards purchase or procure an equal

quantity of labour. Like the declamation of the actor, the

harangue of the orator, or the tune of the musician, the work of

all of them perishes in the very instant of its production.