text: " Though that does not affect the question of the importance of colour for it must imply a defect in the individuals for undoubtedly there is such a thing as nature's harmony of colour; yet it may be admitted that things are not always known by their colour; nay that the actual local colour of objects is mainly altered by effects of light and we are accustomed to see the same things _quoad_ colour variously presented to us--and the inference that we think artists may draw from this fact is that there will be allowed them a great licence in all cases of colour and that naturalness may be preserved without exactness--and here will lie the value of a true theory of the harmony of colours and the application of colouring to pictures most suitable to the intended impression not the most appropriate to the objects