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North Dock.

I.South Dock.

Prince of Wales Dock

Vessels in River.I -n

Fish Market,I

_.-Graving Docks.

---_..------Penetrative Power…

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Penetrative Power of Radium Bromide. Mr. F J. M. Page, writing from the Chemical liaboratory, London Hospital, states that radium bromide seems to have more penetrating powae than the nitrate. Using the bromide h< observed a distinct luminosity on a zinc sulphide screen after the rays had passed through ten post-cards and the card of the screen (in all five A diamond was found to be superior to zinc s ilphicto iD detecting these rays; thus, on covering the bromide with a florin, no effect on the zinc sulphide could be seen, whereas a diamond glowed percep. tibly when placed on a. heap of five florins (8 5 mm.) over the radium salt. A barium piatinocyanide screen proved to afford a slightly more delicate teet than the diamou-i.

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