was not one of our company who did not welcome the return of the sun with thankfulness: all the more so since he came back to a land of blizzards and made many of our difficulties more easy to tackle. Those who got little outside exercise were more affected by the darkness than others. This last year, of course, the difficulties of getting sufficient outdoor exercise were much increased. Variety is important to the man who travels in polar regions: at all events those who went away on sledging expeditions stood the life more successfully than those whose duties tied them to the neighbourhood of the hut.
Other things being equal, the men with the greatest store of nervous energy came best through this expedition. Having more imagination, they have a worse time than their more phlegmatic companions; but they get things done. And when the worst came to the worst, their strength of mind triumphed over their weakness of body. If you want a good polar traveller get a man without too much muscle, with good physical tone, and let his mind be on wires—of steel. And if you can't get both, sacrifice physique and bank on will.
NOTE
A lecture given at this time by Wright on Barrier Surfaces is especially interesting with relation to the Winter Journey and the tragedy of the Polar Party. The general tend of friction set up by a sledge-runner upon snow of ordinary temperature may be called true sliding friction: it is probable that the runners melt to an infinitesimal degree the millions of crystal points over which they glide: the sledge is running upon water. Crystals in such temperatures are larger and softer than those encountered in low temperatures. It is now that halos may be seen in the snow, almost reaching to your feet as you pull, and moving forward with you: we steered sometimes by keeping these halos at a certain angle to us. My experience is that the best pulling surface is at an air temperature of about + 17° Fahr.: Wright's experience is that below +5°
