246 
Literary and Philosophical Intelligence, [Oct. I 7 
sometimes be improved, by mixing 
refuse, or broken glass, or sand and 
wood ashes. 
The patentee also claims the exclu¬ 
sive privilege of appropriating to his 
improved purpose, other slags or vitri¬ 
fied materials, such as those which come 
from the furnaces of smelting houses, 
glass-houses, foundries, &c. or any ma¬ 
terials reduced to a state of vitrification 
by intense heat. These materials are 
then to be bruised, pounded, or ground, 
and sifted through a wire sieve, until re¬ 
duced to such a state of fineness, as may 
be proper for mixing up as a plaster. 
Thus prepared, the materials are sorted 
into different qualities, and put up for 
use. 
The manner of using this material, 
is by mixing it with well burnt lime, 
instead of the sand usually employed in 
the composition of stucco or cement, to 
which water must be added, until a 
proper consistency is obtained. This 
artificial pozzolana, maybe mixed with 
quick Jime, completely pulverised and 
put into casks for use; it is however 
necessary to keep it from moisture, or 
exposure to the open air. The propor¬ 
tion of quick lime to be added to the 
above material, depends entirely upon 
the strength of the lime; in general, 
one measure of good lime will be suffi¬ 
cient for from three to five measures of 
the material. 
Another part of the improvement 
consists in the introduction of various 
colours, and of various coloured bricks, 
which, when highly burnt or vitrified, 
and reduced to powder, is to be mixed 
up with the artificial pozzolana in order 
to produce spots or streaks, in imita¬ 
tion of marble and other variegated 
stone. 
The patentee also claims the exclu¬ 
sive right of using the above vitrified 
earths, and other materials, for mixing 
with lime or plaster of Paris, in casting 
figures, ornaments, and mouldings of 
every description.— July , 1821. 
Sa 
VARIETIES, LITERARY AND PHILOSOPHICAL 
Including Notices of Works in Hand, Domestic and Foreign. 
W E hope in our next, or next fol¬ 
lowing publication, to have the 
gratification of submitting to our read¬ 
ers, the general results of the new po¬ 
pulation returns for Great Britain and 
Ireland. We have already collected 
the local returns as they have trans¬ 
pired in the provincial papers, and we 
are now able, by the obliging communi-' 
cation of an Irish friend, to communi¬ 
cate the returns of some of the principal 
Irish towns. .. 1 
mates of Irish population have been 
made within 150 years : 
Petty’s, in 1672 — 1,100,000 
South’s in 1701 — 1,034,102 
Newenham’s, in 1731 — 2,010,221 
Anon - 1736 — 2,321,412 
--- - 1754 — 2,372,634 
- - 1777 — 2,690,556 
- - 1785 — 2,845,932 
Beaufort’s, in 1792 — 4,088,226 
Newenham’s, in 1805 ■— 5,395,426 
Parliament’s, in 1813 — 5,937,856 
BY THE RETURNS OF 1821. 
No. of Houses. 
Limerick 
8266 
Belfast 
5754 
Youghall, 
1222 
Cashell, 
1142 
Callen, 
1115 
Tullamore, 
999 
Birr, 
2027 
Pop. 
66,043 
35,084 
8804 
5969 
5656 
5561 
5429 
BY THE RETURNS OF 1814. 
176,610 
64,394 
25,467 
24,684 
16,123 
We have also before us, Mr. Shaw 
Mason’s valuable Statistical Report, or 
Parochial Survey of Ireland, the third 
volume of which has just been pub¬ 
lished. It appears, by the preface to 
this volume, that the following esti- 
Dublin 
Cork 
Waterford 
Galway, 
Drogheda 
This last return, however, was so de¬ 
fective, that new returns have been 
made, and we learn that these will 
prove the sister kingdom to contain a 
present population of nearly six mil¬ 
lions AND A HALF. 
Mr. Charles DupiN,thecelebrated 
engineer of the French navy, and 
Member of the French Institute, has 
just published the second part of his 
Travels in Great Britain, The opinions 
of the most distinguished scientific cha¬ 
racters have confirmed the favourable 
opinion we have "expressed of the first 
part, which treated of our military 
strength ; and we are confident the best 
judges will be equally unanimous in 
praise of the second, on the naval 
strength , which we have also examined. 
In these two new volumes relative to 
the English navy, we have found the 
same 
