User:Ineuw/Sandbox4

From Wikisource
Jump to: navigation, search


is dependent on (a) fresh-water communication; on (b) character of stream, that is, of water, as to purity, depth, rapidity, vegetable growth, etc.; on (c) the character of the river-bed, as to size, condition of bottom, etc.; on (d)·

climate, as determined by latitude and by elevation above the sea; and, finally, on (e) various unknown factors arising from the nature or the past history of the species in question, or from the geological history of the rivers."


is dependent on (a) fresh-water communication; on (b) character of stream, that is, of water, as to purity, depth, rapidity, vegetable growth, etc.; on (c) the character of the river-bed, as to size, condition of bottom, etc.; on (d

climate, as determined by latitude and by elevation above the sea; and, finally, on (e) various unknown factors arising from the nature or the past history of the species in question, or from the geological history of the rivers."