but also perhaps in conformity with the universal law of the affinity of materials. Again, the watery fluids dissolved in an atmosphere that is a mixture of different gases, if they separate from the latter on account of cooling, produce snow figures, which in correspondence with the character of the special mixture of gases, often seem very artistic and are extremely beautiful. So, without detracting from the teleological principle by which we judge of organisation, we may well think that the beauty of flowers, of the plumage of birds, or of shell-fish, both in shape and colour, may be ascribed to nature and its faculty of producing forms in an aesthetically purposive way, in its freedom, without particular purposes adapted thereto, according to chemical laws by the arrangement of the material requisite for the organisation in question.