| contain arsenic, | | selenium, thalium, | | and many other | | substances. | | | | Organic matter, as | Gives a brown color to the acid. | a piece of straw | | in a carboy of acid | | | Hydrochloric acid | Arsenic | Marsh's test. | | | Some yellow samples | Reinsh's test; a small piece of | contain no iron, | copper foil becomes coated | but an organic salt,| on boiling in dilute acid. | and give an alkaline| | ash on ignition of | | the residue after | | evaporation | | | Calcium chloride | Calcium hydrate | The clear filtered solution made | | with distilled water is alkaline | | to test paper, and gives a | | precipitate on breathing into it | | through a tube. | | Pure (?) chemicals| Broken glass, bits | These impurities either float or generally | of straw, wood, | sink on solution, and may easily | paper, etc. | be seen. ------------------------------------------------------------------------- G.M. JONES, M.P.S. * * * * * THE CATASTROPHE AT CHANCELADE. The Chancelade quarries near Perigneux, which caved in Oct. 22, 1885, under circumstances that are still fresh in the minds of all, have gained a celebrity that renders it unnecessary for us to revert to the details of the catastrophe. It will suffice to recall the fact that after the accident a private committee was formed for the purpose of making an attempt to save the five victims who had been surprised in the drifts, and who happened to be in the bottom levels. [Illustration: FIG. 1.--PHOTOGRAPHIC EXPLORING APPARATUS.]