re, and to that the man in a hurry would be
able to add his own four miles an hour by walking in the direction of
motion. If the reader is a traveller, and if he will imagine that black
and sulphurous tunnel, swept and garnished, lit and sweet, with a train
much faster than the existing underground trains perpetually ready to go
off with him and never crowded--if he will further imagine this train a
platform set with comfortable seats and neat bookstalls and so forth, he
will get an inkling in just one detail of what he perhaps misses by
living now instead of thirty or forty years ahead.

I have supposed the replacement to occur in the case of the London Inner
Circle Railway, because there the necessary tunnel already exists to
help the imagination of the English reader, but that the specific
replacement will occur is rendered improbable by the fact that the
circle is for much of its circumference entangled with other lines of
communication--the North-Western Railway, for example. As a matter of
fact, as the American reader at least will promptly see, the much more
practicable thing is that upper footpath, with these moving platforms
beside it, running out over the street after the manner of the viaduct
of an elevated railroad. But in some cases, at any rate, the
demonstrated cheapness and practicability of tunnels at a considerable
depth will come into play.

Will this diversion of the vast omnibus traffic of to-day into the air
and underground, together with the segregation of van traffic to
specific routes and times, be the only change in the streets of the new
century? It may be a shock, perhaps, to some minds, but I must confess I
do not see what is to prevent the process of elimination that is
beginning now with the heavy vans spreading until it covers all horse
traffic, and with the disappearance of horse hoofs and the necessary
filth of horses, the road surface may be made a very different thing
from what it is at present, better drained and admirably adapted for the
soft-tired hackney vehicles and the torrent of cyclists. Moreover, there
will be little to prevent a widening of the existing side walks, and the
protection of the passengers from rain and hot sun by awnings, or such
arcades as distinguish Turin, or Sir F. Bramwell's upper footpaths on
the model of the Chester rows. Moreover, there is no reason but the
existing filth why the roadways should not have translucent _velaria_ to
pull over in bright suns