‘ noble forehead ” as could tion of the expulsion of air from porous bodies, a piece soon as cool, the bell may be rung by shaking the flask. be wished, a perfect ‘‘dome of thought,” particularly No sound whatever will be heard if the boiling was of chalk may be placed in water and a vacuum pro- if… … No difficulty will be encountered in these experi- see a lack of the rounded sweep or projection of the BOILING EXPANSION back of the head above the neck, you will find with it ments if good rubber corks are used and rubber tube OF AIR. POINT. joinings between separate glass tubes are avoided. a…
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