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ACTIO?: OF GASES OK B l O L Y ’ H U E S ~ > I.ZSD T r N G S T E S .
but in addition to this there was quite n considerable amount of mercury in the form of drops so small as to be almost pulverulent. This rendered washing exceedingly difficult. The fluid contents of the dish. after the anode has lwei1 raised. are cnrefully decanted from the pondel-. boiling \\ater added, nllo\ved to flow around the dish, anti again \.cry carefully decanted. This was repeated six or seven times, never draining off the last drops to avoid loss of the mercury. If this cart’ is takeii there i5 no difficulty about good results, but the slightest haste results in the loss of mercury. Yaturally when that niuch water remains on the mercury the evaporatioii from the heat of the hand is a most tedious, but the only safe. process. Z < . ~ ~ w z ’ ~I/ .-The ~mt solution contained 0.0933 gram of niercury, 0.1009gram of arsenic, 0.1024 gram of antimony, 0.103I grain of tin, eight granis of tartaric acid. thirty cr. of amnioniuiii hydroxide, and was diluted to 175 cc. T h e currerit gave 0 .j cc. of mixed gases per minute. I t acted for sixteen hours and precipitated 0.0935 gram of mercury. /Lx$cr?’me~zf2.-The conditions were the sanie as in the first experiment. T h e current gave 0.4 cc. of electrolytic gas per minute and precipitated 0,0933 gram of metallic niercury. I made no attempt to separate lead from arsenic, antimony or tin. In conclusion, I would acknowledge m y indebtedness to Prof. Edgar F. Smith, at whose suggestion and under whose supervision the above studies were brought to completion. UNIVEXSITT O F FENNSTLVASIA,
J C L T I . 1b93.
THE ACTION OF GASES UPON METALLIC MOLYBDENUn A N D TUNGSTEN. BS
E D G A R 1;.
S M I T H a l l d YICICPK5
