. The evolution of forces . Fig. 41. Action of molecular forces. Mimicry of plant forms by metallic salts. (Photograph by Prof. St. Leduc.) To face page Fig. 42. Action of molecular forces. Mimicry of plant forms by metallic salts in solution of gelatine. (Photograph by Prof. St. Leduc.) To face page 360. I FORCES MANIFESTED BY LIVING BEINGS 361CHAPTER III THE FORCES MANIFESTED BY LIVING BEINGS § 1.—Living Matter and Cellular Life We observe among living beings very distinct mani-festations of energy :—(1) Physico-chemical forces,such as heat, light, electricity, described in physics;and
. The evolution of forces . Fig. 41. Action of molecular forces. Mimicry of plant forms by metallic salts. (Photograph by Prof. St. Leduc.) To face page Fig. 42. Action of molecular forces. Mimicry of plant forms by metallic salts in solution of gelatine. (Photograph by Prof. St. Leduc.) To face page 360. I FORCES MANIFESTED BY LIVING BEINGS 361CHAPTER III THE FORCES MANIFESTED BY LIVING BEINGS § 1.—Living Matter and Cellular Life We observe among living beings very distinct mani-festations of energy :—(1) Physico-chemical forces,such as heat, light, electricity, described in physics;and (2) those united under the name of vital forces,of the nature and mode of action of which we areprofoundly ignorant. For the sake of completenessI am obliged to speak of these last; but I do so withthe certainty that I can say nothing useful on thesubject. To descant on the phenomena of life whilewo are incapable of explaining why the stone whichleaves the hand falls to the ground is a task whichmust be left to the leisure of metaphysicians. The sole interest which this chapter may possesslies in its showing exactly the present limits of oursligh
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