--Science, or self-styled science, however, insists on playing its tricks with colors as with other matter--if color be matter. There is now a budding theory that the eye is and always has been in a state of development, and that we are yet to discover new colors of which we have at present no idea. In support of this it is urged that in early literature we find only the strong primary colors mentioned--red, blue, black; black, however, being the absence of true color. It is supposed that the other colors were not seen; and in support of this it is urged that Aristotle assigns only four colors to the rainbow. But surely this is scientific trifling. It is natural that early writers upon any subject should notice only the strongest and most salient points connected with it. Its finer gradations become the subject of subsequent discussion. Particularly might this be expected to be the case in the ruder states of society. It is not that the senses cannot perceive; for the savage senses are very keen, as is well known, but that language, perhaps even the mind, does not discriminate. It is content with broad and marked distinctions. So with regard to the eye and color. We may be very sure that a perfect eye sees, and has always seen, all possible color. But unless led thereto by science or art, or love of beauty in dress or ornamentation, the observer is content with noticing the strong tints, red, blue, yellow, black, white--and green also, which is so widely spread over nature. But as to a new color, that is quite impossible, unless some new gradation or combination of color may have a new name given to it. For in the spectrum we have a perfect gradation of colors, all that are in the ray; and after we pass the primaries, the others are but combinations and gradations. To get a new color we must wait for a new eye and a new sun.