. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . ans ses generations successivespresente toujours les memes caracteres dorganisation; il faut ajouterdans les memes localites, et les memes circonstances , 1842. THAT mystery of mysteries as it has been called by one ofour greatest philosophers —this is Darwins phrase regarding the problem before us, theorigin of species—the originor cause of variety in thelife of the globe. That variety exists, thatthere are many kinds andtypes, grades a
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . ans ses generations successivespresente toujours les memes caracteres dorganisation; il faut ajouterdans les memes localites, et les memes circonstances , 1842. THAT mystery of mysteries as it has been called by one ofour greatest philosophers —this is Darwins phrase regarding the problem before us, theorigin of species—the originor cause of variety in thelife of the globe. That variety exists, thatthere are many kinds andtypes, grades and gradations in animal and vege-table life is evident to and trees, beetlesand butterflies, fishes andflowers, ferns and blades ofgrass, all these are objectsof constant green cloak whichcovers the brown earth isthe shield under whichmyriads of organisms,brown and green, carry ontheir life work, and stillfarther below the level ofour ordinary notice existsa range of life scarcely less 1Th\s figure and the others in this chapter are introduced simply toillustrate graphically the variety of animal form. 12. FIG. 1.—Long-horned boring beetle fromCentral America (one-half natural size).1 VARIETY AND UNITY IN LIFE 13 varied. Pasteur has defined fermentation as life without host of chemical changes in organic matter, fermentation,putrefaction, infection of disease—all these are the work ofminute organisms none the less real because invisible and asvaried in form and structure as in the differing effects theirpresence may produce. Each kind of animal or plant, that is, each set of formswhich in the changes of the ages has diverged tangibly from itsneighbors, is called a species. There is no absolute definitionfor the word species. The word kind represents it exactly incommon language, and is just as susceptible to exact definition.
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