What was life? No one knew. It was undoubtedly aware of itself, so soon as it was life; but it did not know what it was. Consciousness, as exhibited by susceptibility to stimulus, was undoubtedly, to a certain degree, present in the lowest, most undeveloped stages of life; it was impossible to fix the first appearance of conscious processes at any point in the history of the individual or the race; impossible to make consciousness contingent upon, say, the presence of a nervous system. The lowest animal forms had no nervous systems, still less a cerebrum; yet no one would venture to deny them the capacity for responding to stimuli. One could suspend life; not merely particular sense-organs, not only nervous reactions, but life itself. One could temporarily suspend the irritability to sensation of every form of living matter in the plant as well as in the animal kingdom; one could narcotize ova and spermatozoa with chloroform, chloral hydrate, or morphine. Consciousness, then, was simply a function of matter organized into life; a function that in higher manifestations turned upon its avatar and became an effort to explore and explain the phenomenon it displayed⁠—a hopeful-hopeless project of life to achieve self-knowledge, nature in recoil⁠—and vainly, in the event, since she cannot be resolved in knowledge, nor life, when all is said, listen to itself.