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 qua nan, 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 comjjosition of Idocrase, by Mr. T. Richardson. Mr. 

 R. remarked that many of the formulas 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. 3. Idocrase from 

 Slatoush in Siberia. 3. Idocrase from Piedmont. 4. Vesuvian 

 from Monte Somma. 5. Egerane from Eger, in Bohemia. 



99.30 100.35 100.30 98.86 100.06 



From these results it appears that Idocrase may be represented 

 by the formula, 7(F0, MO, CaO, MgO)3 Si03+5A1, O3 SiOg. 



Dr. Ure gave a summary of his experiments on fennentatioji, 

 from which among other results it is found that without the ad- 

 dition of yeast, much alcohol is generated in grain worts at an 

 early period of the process of malting. 



Prof. Reich communicated his researches on the electrical cur- 

 re7its in metalliferous veins made in the mine Himmelsfurst, near 

 Freyberg. Phenomena of this sort were first made known by 

 Mr. Fox, and have been since confirmed by the observations of 

 others. Reich considers their cause to be the hydro-electric ac- 

 tion of the metallic components of the vein. 



