widely varying conditions under which, and purposes for which, machines
are used and the very different degrees of importance which differently
constituted minds attach to the peculiarities of various machines, will,
probably, prevent any from becoming extinct. Nevertheless, the very
great advantages which some of these possess over others will, no doubt,
in time become evident by the preponderance of the better class of
machines.

The bicycle, which surpasses all other machines in simplicity,
lightness, and speed, will probably, for these reasons, always remain a
favorite with a large class. The fact that it requires only one track
places it at a great advantage with respect to other machines, for it is
common for a road which is unpleasant from mud or stones to have a hard,
smooth edge, a kind of path, where the bicyclist can travel in peace,
but which is of little advantage to other machines. Again, the bicycle
can be wheeled through narrow gates or door ways, and so kept in places
which are inaccessible to tricycles. One peculiarity of the bicycle,
and to a certain extent of the center-cycle, is that the plane of the
machine always lies in the direction of the resultant force, that the
machine leans over to an amount depending on the velocity and the
sharpness of the curve described. For this reason all lateral strain on
the parts is abolished, and if we except the slipping away of the wheel
from under the rider, which can hardly occur on a country road, an upset
from taking a curve too quickly is impossible. This leaning to either
side by the machine and rider gives rise to that delightful gliding
which none but the bicyclist or the skater can experience. In this
respect the bicycle has an enormous advantage over any machine, tricycle
or Otto, which must at all times remain upright, and which must,
therefore, at a high speed, be taken round a curve with discretion.