%iS 'Experiments with Voltas Galvanic VtU, 



experiments alluded to in my former communication^ I fliall 

 now, in compliance with your obliging requeft, flate to yqu 

 briefly fuch of the refults as feem to me moft deferving of 

 notice. 



ift. When two gold wires^ connected with the extremities 

 of a galvanic column containing ^oo fquare inches of zinc 

 and 400 of copper, were infcrtcd into the legs of an inverted 

 glafs fyphon a-ioths of an inch in diameter and containing 

 thirty grains of diftilled water, the water in one leg gave 

 oxygen gas, ai^d that in the other hydrogen gas, without any 

 apparent diminution of rapidity during a periofl ,0(24 h'^^urs,^ 



3d. When the wires were inferted into two glafs tubes 

 clofed at bottom with double bladders, each tube coiitaining 

 twenty gjrains of diftilled water, and partially immerfed in a 

 glafs of water ; the water ir; the one tube gave oxygen gas, and 

 that ill the other gave hydrogen gas, without any apparent 

 diminution pf rapidity as long as the experiment was con- 

 tinued, which was fometimes upwards of a whole day : but 

 when the quantity of water in each tube exceeded not in 

 weight feveri or eight grains, the production of gas foon began 

 to be fenfibly retarded, and in nine or ten hours totally ceafed, 

 though the water in the tubes during the procefs had loft but 

 a fmall proportion of its bulk; and the power of the column,, 

 which was carefully examined from tii^ie to time, fuftained 

 no perceptible degree of diminution. 



3d. When the wires were inferted into the legs of an in- 

 verted glafs fyphon containing a folution of white arfenic, 

 the fluid contained in one of J.he legs, namely, in that which 

 was conne6led with the leaft oxydable extremity of the co- 

 lumn, acquired, in the fpacc of an hour and a half, the 

 power of reddening the tintlure of turnfol -, a fa6l which was 

 cxpeded without any trial by our ingenious friend Mr. James. 

 Wood. 



4th. When the fyphon was filled with a purple infufion 

 of red cabbage, every thing elfe remaining the fame, the 

 liquor or fluid in one leg foon became red, and that in the 

 other as foon became green. 



5th. When the wires were inferted into two glafs tubes, 

 clofed at bottom with double bladders, each tube containing 



twenty 



