120 British Association for the Advancement of Science. 
other, and its deposition upon those bodies by the agency of a 
current of electricity. 3d. The condition, sine gud non, for effi- 
caciously protecting readily-oxidizable metals against the action 
of free oxygen dissolved in fluids, is to arrange a closed voltaic 
circle, which is made up on one side, of the metal to be protected, 
and another metallic body more readily oxidizable than the for- 
mer, and on the other side, of an electrolyte containing hydrogen, 
as water. 
Prof. Shepard, of the Medical College of the State of South 
Carolina, gave an account of the analysis of a meteorite, in which 
he had detected chlorine and silicon. 
On the composition of Idocrase, by Mr. T. Richardson. Mr. 
R. remarked that many of the formule of minerals are very 
incorrect representations of their constitution. Idocrase in this 
respect is greatly confused, and with the view of endeavoring to 
remove the discrepancies, Mr . R. made with great care the fol- 
lowing analysis of specimens from the cabinet of Mr. Hutton. 
‘No. 1 is Idocrase from Egg, in Norway. 2. Idocrase from 
Slatoush in Siberia. 3. Idocrase from Piedmont. 4. Vesuvian 
from Monte Somma. 5. Egerane from Eger, in Bohemia. 
1. 2. 3. 4, 5. 
Silica, 38.75 37.45 39.25 37.90 38.40 "3 
Alumina, 17.35 18.85 17:30. <1840- -1846> 
Protox. Iron, 8.10 7.75 7.62 489: ...7.40 - * 
Protox. — #3 trace 3.50 vs trace 
Lime, 33.60 35.25 32.25 3469 33.09 
Magnesia, 1.50 1.35 Az. 3.23 3.02 
99.30. 100.35 100.30 98.86 . 100.06 
From these results it appears that Idocrase may be represented 
by the formula, 7/FO, MO, CaO, MgO), SiO,+5Al, O, Si0,- — 
r. Ure gave a summary of his experiments on fer mentation, 
from which among other results it is found that without the ad- 
dition of yeast, much alcohol is generated in ous worts at an 
early period of the process of malting. oe 
Prof. Reich communicated his researches on the electrical cur 
rents in n metalliferous veins made in the mine Himmelsfurst, near 
g. Phenomena of this-sort were first made known by 
firmed by the observations of 
fos , se the hydro-electric ac 
