. Chemical News and Journal of Industrial Science . th acid. The two vessels are connected by a C C Acenaphthene. single would possess a similar contraction to twomembered rings and one five-membered ring. The result is that those C-atoms which are common totwo or three rings respectively have to be counted overtwice or thrice. They are thus subject to double and treblecontractions, and the particular ators are correspondinglysmall. The effects thus overlap in condensed rings, but are,in consequence, additive. This feature is important sinceit enables us to distinguish condensed from uncondens
. Chemical News and Journal of Industrial Science . th acid. The two vessels are connected by a C C Acenaphthene. single would possess a similar contraction to twomembered rings and one five-membered ring. The result is that those C-atoms which are common totwo or three rings respectively have to be counted overtwice or thrice. They are thus subject to double and treblecontractions, and the particular ators are correspondinglysmall. The effects thus overlap in condensed rings, but are,in consequence, additive. This feature is important sinceit enables us to distinguish condensed from uncondensedrings in practice, for if the amount of the contraction isknown the quotient of this and about 245, the contractionfor one group gives the number of groups. If this numbercorrespond with the number of Catoms in the formula oris less, the compound possesses a ring system with the ringsuncondensed. If the number of groups calculated begreater than the number of C-atoms in the formula, the ringsystem is condensed, The difference gives the number of. T-piece, whose projecting arm curves downward. Whenthe acid and ferrous sulphide are in their respective flasks,it is then only necessary to cautiously turn the apparatusupside down in order to get the flow of gas. Obviouslythis cheap and simple instrument would also serve for theproduction of hydrogen, carbon dioxide, and other gases. If the apparatus be so turned as to keep the curved tubeupright, no acid will enter it. However, n would be abetter form of delivery tube. igo Revision oj the Atomic Weight oj Caicimn. Chemical News Oct. 20, 1911 COMPOSITION OF A FALSE SILVER COIN. By J. NEWTON FKIEND and WILLIAM DAVISON. A FLORfN having come into our possession which lookedrather dull and lead-like, we decided to analyse the same,and thereby determine whether or not the coin wasgenuine. The metal lacked the usual ring whichcharacterises genuine coins when thrown on to a hardsurface ; it bent out of shape somewhat more readily thanusua
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