The amount of sophistication varies according to the quality of the medium, and to the state of the same medium at different times; it must be attributed in the best cases physiologically to the medium, intellectually to the control. ↗
Whatever life may really be, it is to us an abstraction: for the word is a generalised term to signify that which is common to all animals and plants, and which is not directly operative in the inorganic world. ↗