thoroughly fixed gas is conveyed for further treat- spread in a vacuum. pencil to make a mark parallel to the scale divisions. Du- ment, in the usual manner. That gaseous matter extends further through space than ring the time elapsing before the completion of the suc- In the engraving, Ais a small… … through a pipe, e, passing to the back varies with the state of the sun’s sur- end of the retort, then to the front, and face, as shown by the coincidence in finally to che back end again, as shown the periods of aurora and sun spots. in Fig. 2, being discharged in a highly In the accounts of…
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