EESEAUCTTKS ON EVAPORATTON AND DISSOCIATION. 310 



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8. Determinations of the va,pour-pressnreg of liquid and 

 solid iodine and bromine {Tram. CJiem. Soc, 188(!, p. 45.3) 

 confirmed our results as to the difference of the vapour- 

 pressures of a substance in the solid and liquid state at the 

 same temperatures; and also the I'elations described under 

 § 6. From this research it appears that the boiling-points 

 of bromine and iodine under normal pressure are respect- 

 ively .58-7° and 184-35° ; and the melting-points, - 7-05° and 

 114'15°. The melting-pressures, — i.e. tlio vapour-})rcKsurc 

 of solid or liquid at the melting-point, — are for bromine, 

 44-5 mms., and for iodine 90 to 91 mms. 



9. Tlio subsequent researches liavo reference to tlio rela- 

 tions of temperature, pressure, and volume of methyl- 

 ethyl-, and propyl-alcohols, ether, -water, acetic acid, and a 

 mixture of alcohol and ether. 



The vapour-pressures at low temperatures were measured 

 by our dynamical method. Those at high temperatures, up 

 to the respective critical points, by a modification of 

 Andrews' apparatus, the tube containing the substance 

 being jacketed by vai)ours, as already described, and the 



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