III. On evaporation and dissociation.—Part II. A study of the thermal properties of alcohol

1. The density of gases is found to increase as the temperature falls towards their condensing point. This may be explained by one of two theories:— (1) That complex gaseous molecules are formed in increasing numbers as the temperature falls; these complex molecules consisting of congeries of the simpler molecules known to exist in gases (see Playfair and Wanklyn, Trans. Roy. Soc. Edin., xxii., (3), p. 441, and ‘Annalen,’ 122, p. 245; also Naumann, ‘Annalen,’ 155, p. 325, and ‘Thermochemie.' pp. 86 et seq.).