I have seen a wasp thus dismember and kill one of these large flies in less than thirty seconds. They seem to perform their murderous acts out of pure pleasure, as they do not linger over their prey after the victim is dead.

The water of Lake Louise is too cold to admit of bathing except in a very brief manner. The temperature of the water near the first of August is about 56°.

The old chalet, built in rustic fashion with unhewn logs, was placed near the lake shore much closer than the present building. One day in 1893, when every one was absent, the building caught fire and burned to the ground. Remarkably enough the forest did not take fire, though some of the trees were close to the building.

Usually in the early morning, before the sun has warmed the atmosphere and started the breezes of daytime into motion, the lake is tranquil and its surface resembles a great mirror. About nine o’clock, the first puffs of wind begin to make little cat’s-paws at the far end of the lake, which widen and extend until finally the whole water becomes rippled. A gentle breeze continues to sweep down the lake from the snow mountains toward the Bow valley all day long, and the water rarely becomes smooth till after sunset. This is the usual order of events in fair weather, a condition which may continue for several weeks without a drop of rain.

The approach and progress of a storm, the wonderful atmospheric changes attending it, and the ever moving clouds obscuring the mountain tops reveal the lake in the full grandeur of its surroundings. An approaching storm is first announced by scattered wisps of cirrus cloud, which move slowly and steadily from the west in an otherwise blue sky. In the course of twenty-four hours the cirrus clouds have become so thick that they often resemble a thin haze far above the highest mountains. The sun with paled light can no longer pierce this ever thickening hazy veil. The wind blows soft and warm from out the south or southwest, and generally brings up the smoke of forest fires from the Pacific coast, and renders the atmosphere still more obscure, till at length the sun appears like a great ball of brass set in a coppery sky. The trees and grass appear to change their color and assume a strange vivid shade of green in the weird light. Sometimes light feathery ashes are wafted over the high mountains south of the lake and settle down gently like flakes of snow. The falling barometer announces the coming storm, and presently another layer of clouds, the low-lying cumulus, form just above the highest peaks and settle gradually lower till they touch the mountain tops. Rain soon follows, the clouds settle till they almost rest on the water of the lake, and the wind increases in violence.

Sometimes thunder-storms of considerable fury sweep through the valley and among the mountains, one after another for several days. A violent thunder-storm at night among these lofty mountains is one of the grandest phenomena of nature. The battling of the elements, the unceasing roar of the wind in the forest, and the crash of thunder redoubled by echoes from the rocky cliffs,—all conspire to fill the imagination with a terrible picture of the majesty and sublimity of nature. From the lake there comes up a low, hoarse murmur, not the roar of ocean surf, but the lesser voice of a small mountain lake lashed to fury and beating with its small waves on a rocky shore. The noise of the forest, the sound of colliding branches as the tall trees sway to and fro in the furious wind, and the frequent crack and crash of dead forest giants overcome by the elements form the dull but fearful monotone, above which the loud rumble of thunder rises in awful grandeur. These are the sounds of a mountain storm.

The bright flashes of lightning reveal a companion picture, for in the momentary light succeeded by absolute darkness the lake is revealed covered with foamy white caps. The forests on the mountain side seem to yield to the blast like a field of wheat in a summer breeze, and the circling clouds sweep about the mountain slopes and conceal all but their bases.

Should the storm clear away during the daytime one may witness grand cloud effects. The low-hanging masses of clouds left behind by the battling elements slowly rise and occasionally reveal small areas of blue sky among the moving vapors. Gentle puffs of air sweep over the calm surface of the water, making little areas of ripples here and there, only to be succeeded by a tranquil calm, as if the storm spirit were sending forth his dying gasps intermittently. While the air is thus calm below, the circling wisps of vapor high up on the mountain, rising and descending, show that the battle between the sun and the clouds is still raging. From above the saturated forests, the rising vapors condense and increase in size till at length, caught in some counter-current, they are swept away or carried downward, while the dissolving cloud spreads out in wisps and streamers till suddenly it disappears into transparent air,—a veritable cloud ghost. At length the mountain tops appear once more, white in a light covering of new snow, and, as the great masses of cumulus rise and disappear the sky appears of that deep blue-black color peculiar to mountain altitudes, while the sun shines out with dazzling brilliancy through the clear atmosphere.

The last visit I made to Lake Louise was toward the middle of October, 1895. A very snowy, disagreeable September had been followed by a long period of milder weather with much bright sunshine. The new snow, which had been quite deep near the lake, had altogether disappeared except high up on the mountain side. It was the true Indian summer, a season with a certain mellow charm peculiar to it alone, characterized by clear sunny weather, a calm atmosphere, a low, riding sun, and short days. Most of the flowers were withered. The deciduous bushes, lately brilliant from frost, were rapidly losing their foliage, and the larches were decked in pale yellow, far up near the tree line. However, the greater part of the vegetation is evergreen, and the spruces, balsams, and pines, the heaths, ericaceous plants, and the mosses contrive to set winter at nought by wearing the garb of a perpetual summer in a region where snow covers the ground three fourths of the year.

I could not resist the temptation as the morning train rolled up to the station at Laggan to get off for the day and make another visit to the lake. The sunrise had been unusually brilliant and there was every promise of a fine day. There is rarely much color at sunrise or sunset in the mountains. The dry clear atmosphere has little power to break up the white light into rainbow colors and give the brilliancy of coloring to be seen near the sea-coast or in the lowlands. The tints are like the air itself—pure, cold, and clear. With more truth they might be called delicate shades or color suggestions. They recall those exquisite but faint hues seen in topaz or tourmaline crystals, or transparent quartz crystals, wherein the minutest trace of some foreign mineral has developed rare spectrum colors and imprisoned them forever. Oftimes the snow of the mountain tops is thus tinted a bright clear pink, beautifully contrasted against the intensely blue sky. I have never seen a deep red on the mountains or clouds at these altitudes. The effect of forest-fire smoke is to give muddy colors: the sun resembles a brazen globe, and the sky becomes coppery in appearance.