roach each other. it must acquire an electric charge unless these leave in compensating proportions. As a matter of fact the misleading, that a succinct account of the whole sub- A given electrical charge is dissipated one hundred ject and of the experimental proof of the most impor- light negative… … ceaseless motion. theSpontan- n i u m com- part of that of radium which also emits both fS and y Radium and thorium compounds emit eousKIectrl- pounds emit -Electroscope for Detecting Pig. 1. rays, the latter of very small intensity. Thorium, ("i I I ii m^ 11 fi T*- also invisible Radio-Activity.…
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