428 
This cloth or paper, so prepared, will take 
any. colour except ink. When it is intended 
to retouch any particular part of the draw- 
ing, it should be marked with a sponge, or 
clean linen, or a pencil (containing some of 
the above-mentioned liquid); if the part is 
only small, it will then rise quickly, and 
appear.as if repainted. 
Intense Light.—It is stated by an emi- 
nent German chemist, that hydrate of lime, 
pulverised, and exposed upon charcoal to a 
stream of oxygen, through a blow pipe, 
with an orifice of 0-02 of an inch in diame- 
ter, fed by a common lamp, gives the most 
intense light. He attributes this to a sort 
.of pulverulent atmosphere, which the lime 
disengages at that tempengsure... Substances 
which do not form molecules in a gaseous 
state cannot produce so vivid an incandes- 
cence, 
Organie Relic.—A workman recently 
broke a mass of very firm conglomerate 
rock, quarried for the new state house, now 
building at New Haven, in the United 
States of America; and found lodged in a 
cavity, so completely enclosed as to exclude 
the possibility of external introduction, a 
piece of wood, the small limb of a tree, ap- 
parently of the pine family, with the bark 
entire ; the wood not mineralized, but fresh 
and in perfect preservation, and not even 
attached to the walls of the cavity, except 
slightly at one end, but lying in it, as ina 
case; the piece of wood was not longer 
.than a finger, and the cavity but two or 
three inches in diameter; it was lined with 
a soft and feebly coherent matter, resembling 
the substance of the rock, in a state of rather 
minute division. The conclusion, from this 
interesting fact appears irresistible, that this 
piece of wood was floating in the waters 
-which were charged with the materials of 
.this rock, and became enclosed during their 
~consolidation—thus proving that this rock 
had never been ignited, and that a tree or 
shrub was in existence when it was formed. 
That it is a very ancient rock of this class 
is evident from its composition presenting 
-quartz, fresh and brilliant, red feldspar, and 
mica, along with entire fragments of gra- 
nite, gniess, mica slate, argillite, &c., be- 
ing evidently an early offset from the de- 
struction of a primitive formation. It 
passes from a fine sand-stone into a coarse 
WORKS IN THE PRESS AND NEW PUBLICATIONS. 
A work, highly interesting to the ancient 
historian, is now in active preparation ; be- 
ing a complete series of Lithographic En- 
gravings, from the Original Model of the 
Great Egyptian Tomb, taken by the late 
traveller, Belzoni, on the spot. It is to be 
brought out by his widow, the possessor of 
the model; and under the patronage of 
H.R.H. the Duke of Clarence. In giving 
the intimation of this beautiful as*well as 
learned work, to our readers, it may not be 
Varieties. 
[Ocr. 
pudding-stone. \ The rock has been usually 
referred, by the American geologists, to the 
red sand-stone formation; it is in many 
places covered by ridges of green-stone 
lias. In the same rock formation, but 
fifty miles from New Haven, were found the 
bones of a large animal. In a similar rock 
in Scotland, certain traces of animals have 
been recently observed.—Si/liman’s Jour- 
nal. 
New Mode of communicating Heat.— 
A patent has been recently obtained for a 
new method of communicating heat, which, 
in some respects, resembles that of heating 
by High Pressure Steam. The Boiler is 
withdrawn from the direct influence of the 
fire, and heat is communicated through 
other substances, the peculiar properties of 
which, constitute the value of the invention. 
Double bottomed vessels are used, and in 
the intermediate space, fluid substances are 
placed, in sufficient quantity to cover and 
protect the flat bottom of the outer vessel. 
The substances used are various, but all 
have the properties of boiling at known and 
fixed degrees of temperature; so that when 
fire is applied to the vessel containing them, 
to raise them to the boiling point, they 
furnish vapour heavier than atmospheric 
air, and easily condensible by comparatively 
hot surfaces, which vapour, coming in con- 
tact with the colder surface of the inner 
vessel, imparts heat thereto, and falls again, 
in the fluid state, to be reheated, whereby 
a constant generation of vapour and return 
of fluid is going forward; and this without 
any mechanical pressure or elastic force 
being exerted, a communication being, at 
all times, kept up, between the fluid me- 
dium and the atmosphere. Thence a fluid 
which boils at 300° (and any degree between 
200 and 700—Fahrenheit may be chosen) 
will impart nearly that degree to substances 
placed in the boiler, without it being pos- 
sible to go beyond it: so that, a proper 
medium being chosen, all chance of burning 
or injuriously heating is avoided. 
By these means it is proposed to supersede 
the use of high pressure steam in various 
processes, where a high but regulated heat 
is necessary, and likewise to produce very 
elastic steam without any danger in the 
process, and at a cost very inferior to what 
is now required for the same effect. 
impertinent to say a few words of the inte- 
resting editress. We have been informed, 
on good authority, that she is a native of 
our own island, though some have dated her 
birth-place from Ireland. She married Mr. 
Belzoni when very young, also accompanied 
him, unrecedingly, through all the scenes 
of his enterprizing destiny ; which was not 
less perilous than various. To his first 
celebrated publication, concerning his dis- 
coveries in Egypt and Nubia, she added a 
