It is certain that no other one _produces_ it.
Mr.Wallace also urges objections drawn from the origin of some of man's mental faculties, such as "the capacity to form ideal conceptions of space and time, of eternity and infinity--the capacity for intense artistic feelings of pleasure, in form, colour and composition--and for those abstract notions of form and number which render geometry and arithmetic possible," also from the origin of the moral sense.[303] The validity of these objections is fully conceded by the Author of this book, but he would push it much further, and contend (as has been now repeatedly said), that another law, or other laws, than "Natural Selection" have determined the evolution of _all_ organic forms, and of inorganic forms also.

And it must be contended that Mr.Wallace, in order to be quite self-consistent, should arrive at the very same conclusion, inasmuch as he is inclined to trace all phenomena to the action of superhuman WILL.

He says:[304] "If therefore we have traced one force, however minute, to an origin in our own WILL, while we have no knowledge of any other primary cause of force, it does not seem an improbable conclusion that all force may be will-force; and thus, that the whole universe is not merely dependent on, but actually _is_, the WILL of higher intelligences, or of one Supreme Intelligence." If there is really evidence, as Mr.Wallace believes, of the action of an overruling intelligence in the evolution of the "human form divine;" if we may go so far as this, then surely an analogous action may well be traced in the production of the horse, the camel, or the dog, so largely identified with human wants and requirements.

And if from other than physical considerations we may believe that such action, though undemonstrable, has been and is; then (reflecting on sensible {281} phenomena the theistic light derived from psychical facts) we may, in the language of Mr.Wallace, "see indications of that power in facts which, by themselves, would not serve to prove its existence."[305] Mr.Murphy, as has been said before, finds it necessary to accept the wide-spread action of "intelligence" as the agent by which _all_ organic forms have been called forth from the inorganic.

But all science tends to unity, and this tendency makes it reasonable to extend to all physical existences a mode of formation which we may have evidence for in any _one_ of them.