movement is sometimes counterbalanced by swinging the hand on the opposite
side. [Footnote: In ordinary walking the speed is nearly four miles an
hour, and can be kept up for a long period. But exercise and a special
aptitude for it enable some men to walk great distances in a relatively
short space of time. Trained walkers have gone seventy-five miles in
twenty hours, and walked the distance of thirty-seven miles at the rate of
five miles an hour. The mountaineers of the Alps are generally good
walkers, and some of them are not less remarkable for endurance than for
speed. Jacques Balmat, who was the first to reach the summit of Mont
Blanc, at sixteen years of age could walk from the hamlet of the Pelerins
to the mountain of La Cote in two hours,--a distance which the best-
trained travelers required from five to six hours to get over. At the time
of his last attempt to reach the top of Mont Blanc, this same guide, then
twenty years old, passed six days and four nights without sleeping or
reposing a single moment. One of his sons, Edouard Balmat, left Paris to
join his regiment at Genoa; he reached Chamouni the fifth day at evening,
having walked three hundred and forty miles. After resting two days, he
set off again for Genoa, where he arrived in two days. Several years
afterward, this same man left the baths at Loueche at two o'clock in the
morning, and reached Chamouni at nine in the evening, having walked a
distance equal to about seventy-five miles in nineteen hours. In 1844, an
old guide of De Saussure, eighty years old, left the hamlet of Prats, in
the valley of Chamouni, in the afternoon, and reached the Grand-Mulets at
ten in the evening; then, after resting some hours, he climbed the glacier
to the vicinity of the Grand Plateau, which has an altitude of about
thirteen thousand feet, and then returned to his village without
stopping.--_Wonders of the Body_.]

THE MUSCULAR SENSE.--When we lift an object, we feel a sensation of
weight, which we can compare with that experienced in lifting another