e is covered with waterproof canvas held in place by
wooden rods, to which it is attached.

The wood employed is pitch pine.

An entire market of 300 stalls can be put up in three hours by one
workman and four assistants.--_Le Genie Civil._

[Illustration: THE MOVABLE MADELEINE FLOWER MARKET AT PARIS.]
FIG. 1.--GENERAL VIEW OF A MOVABLE MARKET.
FIG. 2.--SHOES.
FIG. 3.--MODE OF JOINING THE ROOF TIMBERS.
FIG. 4.--IRON SUPPORT.
FIG. 5.--SECTION OF A SHOE INSERTED IN THE CATCH.
FIG. 6.--CATCHES.
FIG. 7.--WATERPROOF CANVAS.]

* * * * *

DINOCRATES' PROJECT.

Vitruvius relates that the architect Dinocrates proposed to
Alexander the Great to carve Mount Athos in such a way as to give it
the shape of a man, whose one hand should support an entire city, and
whose other should carry a cup which received all the waters from the
mountain, and from which they overflowed into the sea.

Alexander, charmed with the idea, asked him if this city was to be
surrounded by land capable of supplying it with the grain necessary
for its subsistence. Having ascertained that the provisioning could
only be done by sea, Alexander said: "Dinocrates, I grant the beauty
of your project; it pleases me, but I think that any one who should
take it into his head to establish a colony in the place you propose
would run the risk of being taxed with want of foresight; for, just as
a child can neither feed nor develop without the milk of a nurse, so
a city cannot increase without fertile fields, have a large population
without plenty of food, and allow its inhabitants to subsist without
rich harvests; so, while giving the originality of your plan my
approval, I have to say to you that I disapprove of the place that you
have selected for putting it into execution. But I want you to stay
near me, because I shall have need of your services."

This gigantic project had doubtless been suggested to the Macedonian
architect by the singular forms that certain mountains affect. It is
not rare, in fact, to see human profiles delineated upon the sky,
and this phenomenon especially happens in countries where the folded
limestone strata have been broken up in such a way as to give rise to
deep valleys perpendicular to the direction of the chain. If we look
at these folds from below in an oblique direction, we shall se