Each walker must, however, discover for himself what is the food best suited to his needs--remembering always that it is quite possible to spoil a whole day by even trivial dietetic mistakes. If you walk to see and to enjoy, unless you possess that youth which can digest anything, and that vitality which can attack anything, take heed as to what you eat and what you attempt.--Most unfortunate is the remembrance of an otherwise lovely walk I took one day over one of the most lovely of the passes of the Jura. The day was superb; the road by the soft green pastures was superb; and superb was the climb through the tangled brushwood of the slopes. Filmy clouds formed themselves to leeward of the peaks and hid the tops of the pines; above, I gazed into a deep blue sky; beneath, I gazed into a deep green vale; and a tumbling brook sent its music up the heights. But--I had started foodless, and had stuffed into my pockets only a stodgy roll and a box of sardines. By noon I was hungry. I finished the roll _and_ the sardines. With deplorable result. The pancreas rebelled, the senses were dulled, and all the beauties of the Jura were lost upon _heu me miserum_!--Fellow-tramp, take thought for your provender--and "provender" good old Dr Johnson defines as "dry food for brutes."--_That_ is the diet to walk on. § 49 But, after all, one's impedimenta must be chosen according to one's tastes. Mr Hilaire Belloc equipped himself for his seven-hundred-mile walk from Toul to Rome with "a large piece of bread, half-a-pound of smoked ham, a sketch-book, two Nationalist papers, and a quart of the wine of Brulé"[26] (but one halfpennyworth of bread to this intolerable deal of sack!); though farther on he tells us he also carried "a needle, some thread, and a flute."[27] But then Mr Belloc's path lay through thickly-peopled districts; he rarely slept in the open; travelled in summer-time; and not once, I think, lighted a fire: and certes he reached Rome in sorry plight. XXII Practical Details § 50 And now for some hints on the practical details of walking tours of more arduous character and more extended length.[28]--Suit the weight of your knapsack or pack to your strength, leaving a large margin for comfort. If you travel in regions uninhabited by man, and the climate is rigorous, a shelter at night is all-important. Therefore carry a light blanket: a warm head and face induce sleep; so does a change to dry underclothing at the end of the day. For really hard trips, when you walk all day and walk far, you will need, to replace used-up muscular tissue, each day: 3/4 lb. of flour; 3/4 lb. of bacon; 1/2 lb. of beans;