They told us of sledges and rein-deer to carry us over the snow in the winter-time; and, indeed, they have such things, as it would be incredible to relate the particulars of, by which means the Russians travel more in the winter than they can in summer; because in these sledges they are able to run night and day: the snow being frozen, is one universal covering to nature, by which the hills, the vales, the rivers, the lakes, are all smooth, and hard as a stone; and they run upon the surface, without any regard to what is underneath.
The Life and Adventures of Robinson Crusoe
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Daniel Defoe
