Foreign Literature and Science. 375 
sand alone, or with puzzolana, unaffected by acids, whilst 
very unsatisfactory results are obtained by employing it with 
substances which unite well with rich or pure lime. 
Since the quality of natural hydraulic lime depends only 
On the presence ofa certain quantity of clay or igi com- 
bined by heat with calcareous matter, it is natural to suppose 
that in mixing clay in suitable proportions with a ack slacked 
lime, and submitting the mixture to heat, the same result 
might be obtained. Experiments made upon a large seale 
and in various places, have confirmed this opinion so fully, 
that itis now possible to fabricate almost every where and at 
a md moderate price, artificial lime, superior to the nat- 
ura 
14. Tropical. Rasare-~Cixtrecs of a letter from M. Roussin, 
captain of a vessel, dated Cayenne, 28th February, 1820.) 
You will perhaps learn with no inconsiderable interest the 
following meterological fact, the authority of which Tam 
able to certify. From the 1st to the 24th of February, there 
fell upon the isle of Cayenne twelve feet seven inches 4 
water. This observation was made in the country by a 
son of the highest veracity ; and I assured myself, by expe- 
sing a vessel in the middle of my yard, that there fell in the 
city ten and a quarter inches of water, between 8 in the eve- 
ning and 6 in the morning on the night of the 14th and 15th of 
this month. From these enormous rains, which have coy- 
ered with a very high tide, there has resulted an inundation 
from which every plantation has suffered. The -oldest 
assure us that within the memory of AR, nothing 
equal to this has been seen. 
15. Eruption of the Volcano of Goonong-Api.—M. 
Gaumhaner, Dutch resident at Banda, has transmitted de- 
tails of the volcanic eruption of a which took 
place on the eleventh of June phenomenon 
announced itself at half past eleven in the morning, in a 
frightful manner. At half past two o’clock a mass of red 
hot stones flew from me voleano with extraordinary force, 
and set on fire in their flight whatever they happened to 
teach. The st sete ac by the eruption were so 
great, and succeeded each other so rapidly, that the houses 
and even the ships felt the effects. e smoke and ashes 
