We started out to trail the bear's footprints. By these we were led to the blow-holes, where we found the snow about had been circled with a regular trail. Most of these had been abandoned, for the seal has a scent as keen as the bear, but a few "live" holes were located. Sticks were placed to locate these, and after a few days' careful study and hard work we harpooned six seals. Taking only the skins and blubber, we left the carcasses for bruin's share of the chase—to be consumed later. We did not hunt together with the bear—at least, not knowingly.
In these wanderings over game lands we were permitted a very close scrutiny of the animals about, and it was at this time that I came to certain definite conclusions as to prevailing laws of color and dress of our co-habitants of the Polar wastes.
The animals of the Arctic assume a color in accordance to their need for heat transmission. The prevailing influence is white, as light furs permit the least escape of heat. It is evidently more important to confine the heat of the body, than to gather heat from the sun's feeble rays. The necessity for bleaching the furry raiment becomes most operative in winter when the temperature of the air is 150° below that of the body. In the summer, when the continued sunshine is made more heating by the piercing influence of the reflecting snow-fields, there is a tendency to absorb heat. Then nature darkens the skin, which absorbs heat accordingly.
The relative advantage of light and dark shades can be easily demonstrated by placing pieces of white and black cloth on a surface of snow, with a slope at right angles to the sun's rays. If, after a few hours, the cloth is removed the snow under the black cloth will be melted considerably, while that under the white cloth will show little effect.
Nature makes use of this law of physics to ease the hard lot of its creatures fighting the weather in the icy world. The laws of color protection as advocated in the rules of natural selection are not operative here, because of the vitally important demand of heat economy. If we now seek the problem of nature's body colored dyes, with heat economy as the key, our calculations will become easy. The serwah, a species of guillemot, which is as black as the raven in summer, is white in winter. The ptarmigan is light as pearl in winter, but its feathers become tipped with amber in summer. The hare is slightly gray in summer, but, in winter, becomes white as the snow under which it finds food and shelter.
The white fox is gray in summer, the blue fox darkens as the sun advances, while its under fur becomes lighter with increasing cold. The caribou is dark brown as it grazes the moss-colored fields, but becomes nearly white with the permanent snows. The polar bear, as white as nature can make it, with only blubber to mix its paints, basks in the midnight sun with a raiment suggestive of gold. The musk ox changes its dark under-fur for a lighter shade. The raven has a white under-coat in winter. The rat is gray in summer but bleaches to blue-gray in winter time. The laws of selection and heat economy are thus combined.
While thus preparing for the coming winter by seeking animals with furry pelts, the weather conditions made our task increasingly difficult. The storm of the descending sun whipped the seas into white fury and brushed the lands with icy clouds. With the descent of the sun, nature again set its seal of gloom on Arctic life. The cheer of a sunny heaven was blotted from the skies, and the coming of the winter blackness was signalled by the beginning of a warfare of the elements. All hostile nature was now set loose to expend its restive battle energy.
For brief moments the weather was quiet, and then in awe-inspiring silence we steered for sequestered gullies in quest of little creatures. This death-like stillness was in harmony with our loneliness. As the sea was stilled by the iron bonds of frost, as life sought protection under the storm-driven snows of land, the winds, growing even wilder, beat a maddening onslaught over the dead, frozen world. The thunder of elements shook the very rocks under which we slept. Then again would fall a spell of that strange silence—all was dead, the sun glowed no more, the creatures of the wilds were hushed. We were all alone—alone in a vast, white dead world.
LEMMING