So, too, at this one moment of time I can feel consciousness stretching from the crystal-line virus that blights tomato plants, through fish, reptiles and mammals to the minds of men. Indeed, it is obviously only an expedient convention to stop with the forms of life that are earliest in time, or the simplest in space. Consciousness must surely be traced back to the rocks-the rocks which have been here since life began and so make a meeting place for the roots of life in time and space, the earliest and the simplest. Why, indeed, stop with this planet? Even if nothing like the human psyche and intellect have developed elsewhere, it is necessary in an indivisible universe to believe that the principle of consciousness must extend everywhere. Even now I imagine that I can feel all the particles of the universe nourishing my consciousness just as my consciousness informs all the particles of the universe.