This alloy?s so called because it is supposed to consist of one third silver. According to the analyses of Dr. Winkler its composition is: copper, 59.06; silver, 2756; zinc, 957; nickel, 3.42. This alloy is used instead of pure silver in the manufacture of spoons, forks, and other forms of plate, for which purpose it is extremely well adapted, as it is harder than the ordinary alloy of silver, and its color and polish are as good. It would form an admirable material for the cases of the cheap but serviceable watches that are now coming into such general use.