Show Sensitive Instruments There are Instruments made by the hands of men which surpass surpass the eye in keenness and rival rhal the nose The spectroscope cope Is generally considered d done one of the most perfect instruments It will detect the presence of one- one millionth hundred of an ounce of urn um The electroscope however Ismore is ismore ismore more than a million times more sensitive sensitive tive five than th the spectroscope and will detect one one thirty five thousand thirty thousand 1 il- il of an ounce of radium or one millionth of a millionth of a mali mali- ro ll- ll grammel gramme I The will register the heat beat of a candle a mile and a half distant |