After the countries which were the scene of these conquests were pretty
well subdued, Caesar established on some of the great routes of travel a
system of posts, that is, he stationed supplies of horses at intervals
of from ten to twenty miles along the way, so that he himself, or the
officers of his army, or any couriers whore he might have occasion to
send with dispatches could travel with great speed by finding a fresh
horse ready at every stage. By this means he sometimes traveled himself
a hundred miles in a day. This system, thus adopted for military
purposes in Caesar's time, has been continued in almost all countries of
Europe to the present age, and is applied to traveling in carriages as
well as on horseback. A family party purchase a carriage, and arranging
within it all the comforts and conveniences which they will require on
the journey, they set out, taking these post horses, fresh at each
village, to draw them to the next. Thus they can go at any rate of speed
which they desire, instead of being limited in their movements by the
powers of endurance of one set of animals, as they would be compelled to
be if they were to travel with their own. This plan has, for some
reason, never been introduced into America, and it is now probable that
it never will be, as the railway system will doubtless supersede it.

[Sidenote: Caesar's invasion of Britain.]
[Sidenote: His pretext for it.]

One of the most remarkable of the enterprises which Caesar undertook
during the period of these campaigns was his excursion into Great
Britain. The real motive of this expedition was probably a love of
romantic adventure, and a desire to secure for himself at Rome the glory
of having penetrated into remote regions which Roman armies had never
reached before. The pretext, however, which he made to justify his