COMET OBSERVATIONS AT PRINCETON
C. A. Young · Science · 1881
ate actions in the mandibles, Just as contact of the lips with an external body sets up sucking in the infant, All these imovemenits depend upon what we cnil instinct-that is to say, organlic hnbits registered In the iervous system of the race.'Tlhey have arisen by natutal sclec- tiolt alone, because those insects wlich dluly performed them survived, and( those which (lid not duly perlorms themii died out.After a consi(lerable span of life spent in