The theory of evolution is not more and not less a formal principle than the law of causation and the law of the conservation of matter and energy. Indeed it is nothing but the same thing applied to a special case. The theory of evolution is the principle of the conservation of matter and energy applied to the province of life. The theory of evolution denies the possibility of special acts of creation. There cannot come something out of nothing. And the new creations that actually originate daily before our eyes are not creations from nothing, they are simply transformations. There was a time on earth in which no living being existed, neither plant nor animal. How did life originate? Our answer is, It did not originate out of nothing, but it evolved. Non-organised matter organised. That non-organised matter must contain the elementary conditions of organised life is a conclusion which we cannot escape from our point of view; and which is fully and satisfactorily corroborated by our daily experience that water, earth, and air under the sun’s influence are changed into wheat; and wheat is manufactured into the bread which nourishes man and sustains his life. Non-organised particles of matter are constantly being organised in living organisms and displace the worn-out materials in their tissues—not one atom of the latter remaining for good in a healthy living body. The theory of evolution may be called an hypothesis, an assumption, a presumption. But in that case we must say with Mill that the rule twice two is four is also a mere assumption. The evidence for the latter is not stronger than that for the former. Mill declares that after all twice two might somewhere be five. Exactly so and not otherwise evolution might be somewhere interrupted, so that something would originate out of nothing instead of evolving from other things through transformation. Prof. Max Müller speaks very sarcastically about the speechless man, the _homo alalus_ who is supposed to be the ancestor of the present man. He says (l. c., p. 585): “Of the _Homo alalus_, the speechless progenitor of _Homo sapiens_, with whom Professor Romanes seems so intimately acquainted, students of human speech naturally know nothing.”