erfectly whole for ages,
if covered occasionally with a coat of paint, and even without that
preservative, rust would not affect it materially for a period of
fifty years at least. As compared with copper, the cost would be
nearly one half, as it is expected the iron can be furnished at 16
cents per square foot, while copper would at the most moderate
estimate cost 28 cents. As regards the weight of an iron roof, which
at first sight would appear an objection, it is far less than one
formed of slate, and does not much exceed one of copper. The iron
plates weigh three and a half pounds per square foot. A slate roof
would cost about eight cents per square foot, but for durability, and
the ease with which it can be put on and made water tight, the iron
roofing would appear to be far preferable. The plates exhibited were
cast at Troy, New York, and are of the very best quality. The patent
for the eastern States is now owned by Mr. Hiram Hemmistone, of Troy,
in which neighborhood the adaptation of such a durable material for
roofing is rapidly attracting public attention there. Starbuck's
machine shop and foundry at Troy has been covered on this plan, and it
has also been adopted for the roofing of an arsenal at West Point.

* * * * *

THE NEW AND WONDERFUL PAVEMENT.

We presented in a late number, a brief extract from an article on this
subject from the "Eureka," and should have thought no more of it, had
we not observed the following notice editorial in the N, Y. Farmer and
Mechanic. We copy the article entire, that our readers may judge for
themselves whether the style and statements savor most of reality or
humbug.

"NEW PAVEMENTS.--A new system of making streets has been made known to
us;--but as it will be the subject of Patents, here and in Europe, we
can only give some of its most prominent features. A material or
composition, of a very cheap character, has been invented, as hard,
strong and compact as flint. It is formed into any desirable shape in
the course of manufacture. From this, streets of any grade may be
formed, and in such a way as to entirely secure a permanent and level
surface to its proper arch; it can be taken up in five minutes, so as
to get at the water pipes, and on being replaced will, from necessity,
resume its first position. In durability, it will last ten times as
long as granite, and twenty times as long as the common paving,
without liability to re