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That of the third, though its natural tendency is to rise in the

progress of improvement, yet in the same degree of improvement it

may sometimes happen even to fall, sometimes to continue the

same, and sometimes to rise more or less, according as different

accidents render the efforts of human industry, in multiplying

this sort of rude produce, more or less successful.

First Sort.-The first sort of rude produce, of which the price

rises in the progress of improvement, is that which it is scarce

in the power of human industry to multiply at all. It consists in

those things which nature produces only in certain quantities,

and which being of a very perishable nature, it is impossible to

accumulate together the produce of many different seasons. Such

are the greater part of rare and singular birds and fishes, many

different sorts of game, almost all wild-fowl, all birds of

passage in particular, as well as many other things. When wealth,

and the luxury which accompanies it, increase, the demand for

these is likely to increase with them, and no effort of human

industry may be able to increase the supply much beyond what it

was before this increase of the demand.