72 



PROCEEDINGS OF THE AMERICAN ACADEMY 



" Table X. — Experiments with Lead ajid Brass. — Surfaces of 

 lead and brass nearly equal. Volume of water as before mentioned. 



"As some stopcocks may be of copper, a suite of experiments 

 was made to ascertain the effect of this union. 



" Table XI. — Experiments with Lead and Copper. — A bar of 

 lead and copper nail three fourths of an inch long. Lead solder. 



" Table XII. — Experiments icith Lead and Tin. — A half-bar of 

 each soldered without alloy. Volume of water as before mentioned. 



