362 Miscellaneous Intelligence. 
make it yield a better hydraulic lime than a more complete burning; 
but having,. by the lapse of time, had occasion to make further ob- 
servations on the specimens of chalk mortar, which formed the sub- 
ject of the experiments on which that opinion was founded, he has 
taken the opportunity of guarding against any such conclusion being 
drawn from his previous statement.-—(See vol. xvi. p. 386.) 
On examination of the specimens of chalk cement, four months. 
after they were immersed in the water, they were found just in the 
state they were in on the twelfth day; they resisted the trial needle 
to a certain extent only, and not at all like a specimen of good 
hydraulic lime, which was put into water at the same time. 
M. Vicat had occasion to make further remarks on the imperfect 
burning of lime, in consequence of the opportunity afforded by a 
large block of limestone which had been used in the construction of a 
kiln, and which furnished from different parts various specimens 
burnt in different degrees. Five varieties were selected, No. 5, and 
also No. 4, slacked in water, and were therefore set aside as consi- 
derably burnt. Nos. 3, 2, and 1-were not attacked by water, they 
were almost as hard as before burning, and being pulverized, sifted, 
and made into a paste, they were immediately immersed in water 
and left. After a month they were scarcely hardened, and were far 
worse than the specimens of chalk before referred to. ‘The same 
stone pulverized and calcined for twenty minutes on a red hot iron, 
gave a cement not so good as the chalk, but better than the specimen 
from the furnace. 
‘* These experiments,” says M. Vicat, ‘¢ are far from confirming 
the general results announced by M. Minard, (vol. xvi. p. 387); I 
can scarcely believe that we shall ever obtain, I will not say good, 
but even passable, cement, by the calcination, more or less com- 
plete, of pure calcareous stones. We must probably always have 
recourse to the argillaceous limestones, and when these are well 
studied and classed in proportion to the quantity of clay and lime 
which they contain, and that accounts are preserved in all cases of 
the results of the experiments, we shall perhaps be forced to acknow= 
ledge, that nothing is more advantageous than a good hydraulic 
lime, which yielding from 1.1 to 1.3 parts for 1, can for 100 
measured parts receive 160 or 180 of sand, and thus furnish at a 
very moderate price a mortar equally capable of resisting the vicissi- 
tudes of the atmosphere, and the destructive effects of running 
water.—Ann. de Chim. xxv. 60. 
5. On the Application of Muriate of Lime as a Manure—M. Du- 
buc, a druggist, and member of the Academy of Sciences at Rouen, 
has, during the years 1820, 21, 22, and 23, made use of chloride 
of calcium as a manure, or according to his own expression, as a 
vegetable stimulant, His experiments have been numerous, and the 
following short notice is given of them by M. Lemaire Lisancourt. 
