o 180 deg.." A second advantage of Mr. Perkins's mode for
hot-houses, is the small space which the pipes occupy. A third advantage
is, that the water may be circulated without regard to whether the tubes
are below or above the level of the fire-place. "But, however favourable
this plan may be for heating hot-houses, the advantage for that class of
structures are as nothing compared to those which it offers for heating
_dwelling-houses_ and all kinds of _manufactories_. This will be
understood at once, when it is stated that the water may be circulated
under ordinary circumstances of attention to the fire, at from 300 deg. to
600 deg.; and, with extraordinary strength of pipe, and application of fuel
to a still higher degree. It is found that 400 deg. will roast meat. The
workmen in the bank-note printing-office of Messrs. Perkins and Bacon
have dressed a beefsteak at the further extremity of the pipe of hot
water used for heating the steel plates; and Mr. Perkins is constructing
for himself an oven for roasting by water. It is easy to see, that, in a
very short time, this will lead to extraordinary and most beneficial
changes in domestic arrangements; and that if we could get rid of our
prejudices in favour of open fires, the smoky atmospheres of our great
towns would be got rid of at the same time. Water at 500 deg., or, at least,
water at 300 deg., for the purposes of cookery, and for heating reserve
cisterns of cold water, or masses of metal or masonry, for various
domestic purposes, including warming rooms, heating baths, laundries,
&c. may, at no distant time, be circulated by companies, in the same
manner as gas; and, in London, instead of one fire for every room, as at
present, there may be only one in a parish, or in every square of an
acre in area."

_A Marine Railway_

for the purpose of conveying vessels overland, has been projected by Mr.
Henry Fairbairn, in the United Service Journal for May, 1832. The
vessels are to be raised from the sea by machinery, placed in slips and
dragged along the railway by locomotive steam-engines. The same author
proposes to connect Ireland with Scotland, by means of a bank between
Portpatrick and Donaghadee; and England with France, by means of a chain
bridge, causeway, or tunnel, from Dover to Calais. Over all the lines of
marine railways he proposes to form suspension railways, resting upon
arches, in the manner of Mr. Dick's, for the conveyance of passengers,
mails, and me