The Philosophical magazine; a journal of theoretical, experimental and applied physics . nder which theseunknown bodies polymerize, and thus escape us. If it berash to hope to obtain these bodies in the near future, it wouldbe still more so to say that their discovery was word is profoundly repugnant to our tendencies and scien-tific habits. When we measure the progress of science since thecommencement of the century in a domain so vast as Che-mistry, there are many reasons for not being discouraged. * Arsenious oxide volatilizes, as is well known, at about 200° withoutmelting.
The Philosophical magazine; a journal of theoretical, experimental and applied physics . nder which theseunknown bodies polymerize, and thus escape us. If it berash to hope to obtain these bodies in the near future, it wouldbe still more so to say that their discovery was word is profoundly repugnant to our tendencies and scien-tific habits. When we measure the progress of science since thecommencement of the century in a domain so vast as Che-mistry, there are many reasons for not being discouraged. * Arsenious oxide volatilizes, as is well known, at about 200° withoutmelting. This temperature is not the boiling-point properly so called,but is really the temperature of depolymerization of the molecule (ASj03)„into (AsjOj)^. of the Metallic 113 o ® 2 !2? o P •fs: CD C- 2. ®p a CO o Oo o CO pcT ol P* to p oo o3 sT CD ^ 3 ^ orq ow orq pft- N a aa. CDOO 3o CO p CD ^ -K ^ • W ^ Ji ^. ^ D ! . trt- • : 5 o : • ?n to o CO obo b H3 o c-t-. p oo GO o p P/h7. J%. S. T). Vol. 20. No. 128. Ai/onsl 1885. lll Prof. Louis Henry on the Polymerization Appendix. Dehydration and Cotidensation of the Hydroxidesby Heat. It has been already stated that the hydroxides, under theaction of a gradually increasing temperature, undergo a pro-gressiye dehydration, whilst at the same time their moleculesbecome more and more condensed by the accumulation of theresidual oxyhydroxidesof the radical of the primitive is the cause of this general fact ? This phenomenon isanalogous, both in appearance and result, to that of directetherijication, i. e. to the action of an acid on an alcohol. Infact, etheritication is an example of the production of ananhydrous oxide from its hydroxide. The most simple caseis that in which we can follow step by step the work ofdehydration, as with ordinary lactic acid. Lactic acid, CsHgOs, is the dihydroxide of the radicallactyl, C3H4O, which we may represent by La. On heating,lactic acid giyes successi
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