a "_black_-board." So, too, ask the man in the street for the colour of trees, and he will reply "green." If I may permit myself a vulgar locution, the green is in his eye. Trees are, of course, all colours of the rainbow, according to kind and season; and grass, too, is by no means always so green as people think it. We start in our childhood with prejudices on these subjects--what is education but the systematic imparting of prejudice?--and we rarely recover. Even the primitive rhymes of childhood fix ideas unalterably in our minds: The rose is red, the violet's blue, Sugar is sweet and so are you. Tea-roses are not red nor Neapolitan violets blue; sugar is only sweet to those unversed in metaphysics, and sugar of lead not even to them. As for the compliment to the juvenile petticoat, let it remain. But the blackness of black is a superstition that deserves no such courteous concessions. There is, in fact, no black and no white at all, as any black-and-white artist will tell you. Black is not a colour: it is merely the negation of light. By day nothing is ever black--it always contains reflected light from some surrounding object or objects: if you look at a "black" thing by day, you see its details, which convincingly proves that light is not absent. If there were such a thing as a black object, it could only prove its existence by being seen; but if it is seen it is no longer black, and if it is black it is no longer seen. The mourners at a funeral no more wear black than the bridesmaids at a wedding wear white. To be white, a thing would have to escape all reflected light; and even if this were possible, the sunlight itself, the source of all light and colour, would tinge it with yellow, or red, or pink, according to the time of day. "What!" the injudicious reader will cry, "is not snow white? Does not the Dictionary boast even a double-barreled epithet 'snow-white'! How about the 'great white sea' that stretches round the Pole?" I cannot help it: these adjectives, these expressions were invented before artists had taught men to see: hastily, as by men falling in love at first sight, who are destined to make many discoveries concerning their idol later on. Snow is never white, any more than the beloved is absolutely blameless. For snow to be "snow-white," the sky would have to be white, whereas in those arctic circles it should be either blue or grey. Moreover, the snow being only semi-opaque must be tinctured by the shadow of the darkness of its own depths; as for icebergs, well, you may see green, brown, and even deep-grey ice, whilst the whitest have pinnacles and crags that must break the light like prisms into all the colours of the spectrum, and all these hues, again, do not fail to tint the snow. Nor will the white bear improve the situation, for, to judge by the specimen in our London Zoological Gardens, white bears are dirty yellow, just as black bears are dirty brown.