As the process is an exceedingly simple one and free from the drawbacks of the aræometer, we are justified in concluding that the aræo-picnometer will soon be in general use.
H. HENSOLDT, Ph.D.
Petrographical Laboratory, School of Mines, Columbia College.
[Continued from SUPPLEMENT, No. 793, page 12669.]
GASEOUS ILLUMINANTS.[1]
By Prof. VIVIAN B LEWES.
IV.
Mr. Frank Livesey, in the concluding sentence of a paper read before the Southern District Association of Gas Managers and Engineers during the past month, on "A Ready Means of Enriching Coal Gas," speaking of enrichment by gasolene by the Maxim-Clarke process, said "it should, in many cases, take the place of cannel, to be replaced in its turn, probably, by a water gas carbureted to 20 or 25 candle power." And now, having fully reviewed the methods either in use or proposed for the enrichment of gas, we will pass on to this, the probable cannel of the future.