"THERE IS A HARMONY OF NUMBERS IN ALL NATURE; in the force of gravity, in the planetary movements, in the laws of heat, light, electricity, and chemical affinity, in the forms of animals and plants, in the perception of the mind. The direction, indeed, of modern natural and physical science, is towards a generalization which shall express the fundamental laws of all, by one simple numerical ratio. We would refer to Professor Whewell's 'Philosophy of the Inductive Sciences,' and to Mr. Hay's researches into the laws of harmonious colouring and form. From these it appears that the number seven is distinguished in the laws regulating the harmonious Perception of forms, colours, and sounds, and probably of taste also, if we could analyse our sensations of this kind with mathematical accuracy." (Medical Review, July, 1844).