Sir William Francis Butler,
The Great Lone Land
“ If there is no track in the snow a man goes in front on snow-shoes, and the leading dog, or "foregoer," as he is called, trots close behind him. If there should be a track, however faint, the dog-will follow it himself; and when sight fails to show it, or storm has hidden it beneath drifts, his sense of smell will enable him to keep straight. Thus through the long waste we journey on, by frozen lakelet, by willow copse, through pine forest, or over treeless prairie, until the winter's day draws to its close and the darkening landscape bids us seek some resting-place for the night. ”
