. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . r largely unanalyzed and hence notdirectly referable to specific physico-chemical causes, between substances ofparticular chemical and physical struc-ture and those familiar forms of energyknown to us in the physicochemicalworld, or is it the result or manifestationof an extra physicochemical force andset of conditions? When the sunflower bends its facealways toward the sun, we do not at-tribute this behavior either to the in-telligence or the instinct of
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . r largely unanalyzed and hence notdirectly referable to specific physico-chemical causes, between substances ofparticular chemical and physical struc-ture and those familiar forms of energyknown to us in the physicochemicalworld, or is it the result or manifestationof an extra physicochemical force andset of conditions? When the sunflower bends its facealways toward the sun, we do not at-tribute this behavior either to the in-telligence or the instinct of the when young spiderlings or mothcaterpillars or green aphids just fromthe egg move with one accord toward the light side of the glass jar, we do attribute this behavior toanimal instinct or to the exercise of a preference or iron filings rush toward a magnet brought sufficientlynear them, we have on our tongues end the sufficient explana-tion of this behavior in the single word magnetism. Nowthe biological mechanist, observing that in all these casesthere is a certain apparent definite relation between a cause. FIG. 163. — Extra- ovatesfrom the eggs of the seaurchin, Arbacia. By di-luting the sea water theosmotic pressure burststhe egg membranes sothat part of the egg plasmissues and forms an ex-tra-ovate. (After Loeb.) 282 EVOLUTION AND ANIMAL LIFE D
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