ess already made. Wide
streets have replaced narrow alleys, air circulates freely everywhere,
trees and enormous gardens have been planted on every side, and the
salubrity of the house is assured by a severe inspection, one which will
become yet more severe, it is to be hoped, in the case of those owners
who are inclined to despise regulations. It would be so simple in place
of continuing the ancient ways, whose inconveniences are so well
demonstrated in the large model of an unhealthy house exhibited in the
pavilion of the city of Paris, to adopt all the new systems of
sanitation which, on their part, are shown in application in the model
of a sanitarily perfect house which has been placed opposite to it. To
establish this comparison two very simple models of construction have
been selected, proving that healthfulness is not merely an attribute of
luxury, but that the most modest houses can present all possible
guaranties from this point of view. The healthfulness of houses, and
consequently of cities, depends amongst other multiple but relatively
simple causes on two preeminent conditions,--that of the removal of
excrement, and the purity of the water-supply. In a large degree the
first condition is subordinated to the second. "Everything to the sewer"
is recognized by the most competent hygienists as the best system, but
only on the condition that water shall be abundant and that no
stagnation of the material shall be allowed. These problems, which were
for a long time studied by M. Durand-Claye, and to which he devoted
himself until his premature death unfortunately took him from us, have
received the attention of his devoted successors, who have already
brought to fruition interesting solutions which prompt us to hope for a
completely satisfactory system in the near future.

Three glass reservoirs, containing water from the Seine, from the Ourcq
and the Vanne, allow us to perceive the difference of quality which
exists between these three sources of supply, the first of which, with
its yellow color, is anything but appetizing, and the second is not much
less doubtful, while the third, alone, presents the limpidity and
transparency which one has a right to demand in potable water.
Nevertheless, one should not believe, as many persons do, that the water
that we see in this reservoir, and which has been taken within the
limits of Paris, is the same that is distributed from time to time
through each quarter. The water