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—According to the before-mentioned authority, Saposhniko, in 1908, determined the hardness of various lead-tin alloys by Brineli’s method, by which a steel cone is forced into the metal. The results he obtained are as follow:

Lead	100	90	80	70	60	50	40	34	33	32	30	20	10	0
Tin	0	10	20	30	40	50	60	66	67	68	70	80	90	100
Hardness	3·9	10·1	12·16	14·5	15·8	15·0	14·6	16·7	15·4	14·6	15·8	15·2	13·3	4·1

These results, says Mr. Hiorns, show that the hardest alloy is the one with 66% (about 2 parts) of tin and 34% (about 1 part) of lead, which also is the one having the lowest melting point of all the lead-tin alloys. The results also show that tin is slightly harder than lead.