theory of colours, n.Definitions

Theory of Colours (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not a failed theory but no theory at all, predicting nothing and without any crucial experiment, like James's psychology.