had but two sets of gears,--a slow and a
fast. All intermediate speeds were obtained by throttling the
engine. The engine was easily governed, and on the level any speed
from the lowest to the maximum could be obtained without juggling
with the clutches; but on bad roads and in hilly localities
intermediate gears are required if one is to get the best results
out of a motor. As the gasoline motor develops its highest
efficiency when it is running at full speed, there should be
enough intermediate gears so the maximum speed may be maintained
under varying conditions. As the road gets heavy or the grades
steep, the drop is made from one gear down to another; but at all
times and under all conditions--if there are enough intermediate
gears--the machine is being driven with the motor running fast.

With only two gears where roads or grades are such that the high
gear cannot be used, there is nothing to do but drop to the low,
--from thirty miles an hour to five or six,--and the engine runs as
if it had no load at all. American roads especially demand
intermediate gears if best results are to be attained, the
conditions change so from mile to mile.

Foreign machines are equipped with from three to five
speed-changing gears in addition to the spark control, and many
also have throttles for governing the speed of the engine.

Going at full speed down a long hill about two miles out of
Canandaigua, we discovered that neither power nor brakes had any
control over the machine. The large set-screws holding the two
halves of the rear-axle in the differential gears had worked loose
and the right half was steadily working out. As both brakes
operated through the differential, both were useless, and the
machine was beyond control. An obstacle or a bad turn at the
bottom meant disaster; happily the hill terminated in a level
stretch of softer road, which checked the speed and the machine
came slowly to a stop.

The sensation of rushing down hill with power and brakes
absolutely detached is peculiar and exhilarating. It is quite like
coasting or tobogganing; the excitement is in proportion to the
risk; the chance of safety lies in a clear road; for the time
being the machine is a huge projectile, a flying mass, a ton of
metal rushing through space; there is no sensation of fear, not a
tremor of the nerves, but one becomes for the moment exceedingly
alert, with instantaneous comprehension of the character of the
road; every rut,