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The amount of pollen given off by some wind-fertilized trees so great in some places that it covers hundreds of square miles of earth and water with a film of yellow dust -strikes us as an amazing waste of material on the part of nature; but in these cases we readily see that this excessive prodigality is necessary to continue the species, and that a sufficient number of flowers would not be impregnated unless the entire trees were bathed for days in the fertilizing cloud, in which only one out of many millions of floating particles can ever hit the mark.
Above the lower tree-line, which is also the snowline, mapped out abruptly by the sun, one finds spreading growth of pinon, juniper, branched nearly to the ground, lilac and sage, and scattering white pines. There is no special preponderance of self-fertilized or wind-fertilized plants, but everywhere the demand for and evidence of insect life.
Even pollen, which would not rarely be lodged upon these leaves, as it falls from surrounding wind-fertilized plants, also small seeds, excited the same action, and showed signs of being acted upon. "We may therefore conclude," with Mr.
Above the lower tree-line, which is also the snow-line, mapped out abruptly by the sun, one finds spreading growth of piñon, juniper, branched nearly to the ground, lilac and sage, and scattering white pines. There is no special preponderance of self-fertilized or wind-fertilized plants, but everywhere the demand for and evidence of insect life.
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