. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . Classification is theprocess of reducing ourknowledge of thesegrades of likeness andunlikeness to a bringing togetherthose which are funda-mentally alike, andseparating those whichare unlike, we find that these traits are the tmtcome of long-continued is defined as the rational lawful disposition ofobserved facts. It rests on the results of the operations ofnatural laws, or forces which bring about inevitable results. F
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . Classification is theprocess of reducing ourknowledge of thesegrades of likeness andunlikeness to a bringing togetherthose which are funda-mentally alike, andseparating those whichare unlike, we find that these traits are the tmtcome of long-continued is defined as the rational lawful disposition ofobserved facts. It rests on the results of the operations ofnatural laws, or forces which bring about inevitable results. For it is a matter of common observation that the closesthomologies are shown by those animals which have sprung froma common stock. The fact of blood relationship shows itselfalways in homology. So far as we know, homology is neverproduced in any other way, therefore the actual presence ofhomologies among animals or plants implies, as we shall see in alater chapter, their common descent from stock possessing thesesame characters. In our primitive use of the trunk of the treeto imply unity in life, we can see that this trunk represents. FIG. 105.—Diagram of wings, showing homol-ogy and analogy: a, wing of fly; b, wing ofbird; c, wing of bat. 174 EVOLUTION AND ANIMAL LIFE homology, and that it is the representation of the current ofheredity. The resemblances arise from common origin, the
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