Foreign Literature and Science, 185 
able ice-holders have been contrived, holding from 100 Ibs. 
to 500 Ibs. in which the ice may reserved for daily use 
for ten or fifteen days, which gives each family the facility of 
using it at discretion. Means are on hand for constructing 
refrigerators for the purpose of lowering the temperature of 
the chambers of the sick, and other apartments. —Rev. Enc. 
Av. 1826. 
2. Mineralogy of Vesuvius—M. MonrIceELLt, Secretary 
of the Royal Academy of Sciences at Naples, who has observed 
and described various eruptions of Vesuvius, and found an im- 
mense collection of its products, has undertaken, with the 
aid of M. Covelli, an associate of the Academy, a complete 
description of those interesting substances, among which are 
many entirely new. They find that the greater number of 
the crystals of Vesuvius present frequent-anomalies in their 
structure and composition. Often, in the interior of their 
mass, are crystals or crystalline grains belonging to different 
species, without lessening, in any degree, the perfection of 
the exterior form. 
The number of species described, amounts to$2. In the 
first class, the order of metalloides is first presented: Sul- 
phur, sulphurous, and sulphuric acids, muriatic acid, azote, 
-boracie acid, carbonic acid, water and sulphuretted hydro- 
gen. The second order, that of electro-negative metals, 
The Silicium I crys 
matic and fusiform, in needles, grains, &c. It is quite rare 
Le 
crystalline and the corneous. The latter is of a pearl white, 
and an aspect like gum arabic. The muriate of lead is com- 
monly white and colourless ; it sublimes at a red heat, leav- 
ing no residue, and producing white thick fumes. It is whol- 
ly soluble in water, and reducible to metallic lead by the 
VOb, XIL.—NO. 1. ae 
