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ALUMINUM AND BISMUTH.-These two metals combine easily, the alloys being very fusible, as might be expected of alloys with bismuth.
They remain unchanged in the air at ordinary temperatures, but oxidize rapidly when melted.
Bismuth makes aluminum very brittle.
No valuable alloys of these two metals have as yet been discovered. ALUMINUM AND VANADIUM.-Vanadium is a good hardener of aluminum, and can readily be alloyed with it, due to its presence in some of the bauxites that are native aluminum ores.--AZzminum Wodd.
BREVITIES.
From the Scientz$c American, we learn that M. Raoul Pictet, who has done much original chemical work at low temperatures, suggests that by making use of Zoow temperatures syntheses may be effected which would be otherwise impossible.
In many chemical operations the heat generated so raises the general temperature of the bodies acted upon that all control over the combination is lost. At very low temperatures, however, all chemical action ceases.
By choosing the right temperature, therefore, reactions between substances may be made to take place as slowly as desired.
By this means M. Pictet has effected combinations that are' impossible at ordinary temperatures.
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