But although life is not energy, any more than it is matter, yet it directs energy and thereby controls arrangements of matter. Through the agency of life specific structures are composed which would not otherwise exist, from a sea-shell to a cathedral, from a blade of grass to an oak; and specific distributions of energy are caused, from the luminosity of a firefly to an electric arc, from the song of a cricket to an oratorio. Life makes use of any automatic activities, or transferences and declensions of energy, which are either potentially or actually occurring. In especial it makes use of the torrent of ether tremors which reach the earth from the sun. Every plant is doing it constantly. Admittedly life exerts no force, it does no work, but it makes effective the energy available for an organism which it controls and vivifies; it determines in what direction and when work shall be done. It is plain matter of fact that it does this, whether we understand the method or not,--and thus indirectly life interacts with and influences the material world. The energy of coal is indirectly wholly solar, but without human interference it might remain buried in the earth, and certainly would never propel a ship across the Atlantic. One way of putting the matter is to say that life _times_, and _directs_. If it runs a railway train, it runs the train not like a locomotive but like a General Manager. It enters into battle with a walking-stick, but guns are fired to its orders. It may be said to aim and fire: one of its functions is to discriminate between the wholesome and the deleterious, between friend and foe. That is a function outside the scope of physics. Energy controlled by life is not random energy: the kind of self-composition or personal structure built by it depends on the kind of life-unit which is operating, not on the pabulum which is supplied. The same food will serve to build a pig, a chicken, or a man. Food which is assimilable at all takes a shape determined by the nature of the operative organism, and indeed by the portion of the organism actually reached by it. Unconscious constructive ability is as active in each cell of the body as in a honeycomb; only in a beehive we can see the operators at work. The construction of an eye or an ear is still more astonishing. In the inorganic world such structures would be meaningless, for there would be nothing to respond to their stimulus; they can only serve elementary mind and consciousness. The brain and nerve system is an instrument of transmutation or translation from the physical to the mental, and _vice versa_. STAGES OF EVOLUTION Steps in the progress of evolution--great stages which have been likened by Sir James Crichton Browne to exceptional Mendelian Mutations--may be rather imaginatively rehearsed somewhat thus:-- Starting with The uniform Ether of Space, we can first suppose The specialisation or organisation of specks of ether into Electrons; followed by