364 Galvanic Experiments. 



iii the ore, was soft to the touch, like an alkaline ley; it 

 gave, on evaporation, an alkaline residue, and we may easily 

 deduce from it the following theorv : 



The mastic is mixed with the lazuli to combine oil with 

 ultra-marine in order to form a kind of soap, which warm 

 water takes tway, rendering it a little soluble; while the 

 matrix remains entangled in the mastic, from which it can- 

 not be dissolved so easily as the ultra- marine, because it 

 wants soda, and consequently eaimot separate, like ultra? 

 marine, from the fa; ' lance, which forms a kind 



of net for it. In a word, the process of extraction ot ultra- 

 marine is a true savonnage (ley-making) ; — let the awkward- 

 ness of this expression be excused on account of its con- 

 venience. 



We have here given what appears to us may be concluded 

 from our experiments without hazarding too much. May 

 this first experiment, upon a substance equally little known 

 as it is singular, be followed by its artificial production ! 



LIX. Galvanic Experiment* /// Mr. D. Gardner, Lecturer 

 on Chemistry at the City Dispensary. 



To Mr. Tilloch. 



DEAR SIR, 



An the course of performing a few galvanic experiments, I 

 was induced to try the effect of that fluid on some of the 

 vegetable infusions. 



Turmeric in distilled water was the first submitted to trial; 

 about six drachms in a glass lube containing two blight iron 

 wires, forming the circuit between two batteries containing 

 twenty-five plates of six inches square surface. Gas was 

 given out from b )th wires and the infusion became gradually 

 changed from a bright yellow to a deep brown, beginning 

 at the upper part of the tube; both wires became black, most 

 probably from their combination with the oxygen evolved 

 from the water. The same quantity of the infusion of lit- 

 mus in distilled water was subjected in the same manner to 

 the galvanic action : in 3 .'-\v minutes the blue tinge began 

 to fade_, the liquor became more diaphanous, and at length 



exhibited 



