29, reprinted from the _Atlantic Monthly_ for July, August, and October, 1860.
[260] "Origin of Species," 5th edition, p.

571.
[261] "Animals and Plants under Domestication," vol.ii.p.

431.
[262] The Rev.Baden Powell says, "All sciences approach perfection as they approach to a unity of first principles,--in all cases recurring to or tending towards certain high elementary conceptions which are the representatives of the unity of the great archetypal ideas according to which the whole system is arranged.

Inductive conceptions, very partially and imperfectly realized and apprehended by human intellect, are the exponents in our minds of these great principles in nature." "All science is but the partial reflexion in the _reason of man_, of the great all-pervading _reason of the universe_.

And thus the _unity_ of science is the reflexion of the _unity_ of nature, and of the _unity_ of that supreme reason and intelligence which pervades and rules over nature, and from whence all reason and all science is derived." (Unity of Worlds, Essay i., Sec.