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 see them

superposed upon one another in such a way as to represent figures that

recall a human profile.

[Illustration: FIG. 1. LANDSCAPE BY FATHER KIRCHER.]

In the seventeenth century, Father Kircher conceived the idea of

taking up Dinocrates' plan upon a small scale, and composed the

landscape shown in Fig. 1. The drawing remained engraved for a long

time upon a marble tablet set into the wall of Cardinal Montalte's

garden at Rome. Later on, artists improved and varied this project, as

shown in Figs. 2 and 3. By looking at these cuts from the sides of the

page, it will be seen that they form human profiles. Fig. 2 represents

an old woman, and Fig. 3 a man whose beard and hair are formed by

shrubbery.

[Illustration: FIGS. 2 AND 3.--LANDSCAPES SHOWING PROFILES OF

HUMAN FACE.]

We do not think that these conceptions have ever been realized,

although Heron in his treatise on Dioptra, and Father Scott in his

Parastatic Magic, have described instruments that permit of making the

necessary outlines to cause grounds to present a given aspect from

a given point. These instruments consist essentially of a vertical

transparent frame upon which is drawn a vertical projection of the

landscape that it is desired to obtain.

* * * * *

In the island of Goa, near Bombay, there is a singular vegetable

called "the sorrowful tree," because it only flourishes in the night.

At sunset no flowers are to be seen, and yet after half an hour it is

full of them. They yield a sweet smell, but the sun no sooner begins

to shine upon them than some of them fall off, and others close up;

and thus it continues flowering in the night during the whole year.

* * * * *

Scientific American Supplement, No. 488, May 9, 1885 · 第 31 / 59 题