. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 203.—Giant gall of the white oak (California) made by the gall fly, Andrims cali-fornicus; the gall at the right cut open to show the tunnels made by the insects inescaping from the gall. (From photograph.) have reached the mountain streams of Idaho, greatly changedin appearance, discolored, worn, and distorted. The male ishumpbacked, wTith sunken scales and greatly enlarged, hooked,bent, or twisted jaws, with enlarged doglike teeth. On reach-ing the
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . FIG. 203.—Giant gall of the white oak (California) made by the gall fly, Andrims cali-fornicus; the gall at the right cut open to show the tunnels made by the insects inescaping from the gall. (From photograph.) have reached the mountain streams of Idaho, greatly changedin appearance, discolored, worn, and distorted. The male ishumpbacked, wTith sunken scales and greatly enlarged, hooked,bent, or twisted jaws, with enlarged doglike teeth. On reach-ing the spawning beds, which may be a thousand miles fromthe sea in the Columbia, over two thousand miles in the Yukon,the female deposits her eggs in the gravel of some shallow male covers them and scrapes the gravel over both male and female drift tail foremost helplessly downthe stream: none, so far as certainly known, ever survives thereproductive act. The same habits are found in the four otherspecies of salmon in the Pacific, but in most cases the individualsdo not start so early nor run so far. The blueback salmo
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Keywords: ., bookauthorkelloggvernonlvernonl, bookcentury1900, bookdecade1900
