the race of plants and animals, which he says may be regarded as one of
the general laws of nature.

I am told that it is a maxim among the improvers of cattle that you may
breed to any degree of nicety you please, and they found this maxim
upon another, which is that some of the offspring will possess the
desirable qualities of the parents in a greater degree. In the famous
Leicestershire breed of sheep, the object is to procure them with small
heads and small legs. Proceeding upon these breeding maxims, it is
evident that we might go on till the heads and legs were evanescent
quantities, but this is so palpable an absurdity that we may be quite
sure that the premises are not just and that there really is a limit,
though we cannot see it or say exactly where it is. In this case, the
point of the greatest degree of improvement, or the smallest size of
the head and legs, may be said to be undefined, but this is very
different from unlimited, or from indefinite, in Mr Condorcet's
acceptation of the term. Though I may not be able in the present
instance to mark the limit at which further improvement will stop, I
can very easily mention a point at which it will not arrive. I should
not scruple to assert that were the breeding to continue for ever, the
head and legs of these sheep would never be so small as the head and
legs of a rat.

It cannot be true, therefore, that among animals, some of the offspring
will possess the desirable qualities of the parents in a greater
degree, or that animals are indefinitely perfectible.

The progress of a wild plant to a beautiful garden flower is perhaps
more marked and striking than anything that takes place among animals,
yet even here it would be the height of absurdity to assert that the
progress was unlimited or indefinite.

One of the most obvious features of the improvement is the increase of
size. The flower has grown gradually larger by cultivation. If the
progress were really unlimited it might be increased ad infinitum, but
this is so gross an absurdity that we may be quite sure that among
plants as well as among animals there is a limit to improvement, though
we do not exactly know where it is. It is probable that the gardeners
who contend for flower prizes have often applied stronger dressing
without success. At the same time it would be highly presumptuous in
any man to say that he had seen the finest carnation or anemone that
could ever be made to grow. He might howe