This very spring (1883), as I walked about a town in the evening, I used to listen to find if I could hear any one mention the zodiacal light, which, just after sunset, was distinctly visible for a fortnight at a time. It was more than usually distinct, a perfect cone, reaching far up into the sky among the western stars. No one seemed to observe it, though it faced them evening after evening. Here was an instance in the opposite direction--a curious phenomenon, even now rather the subject of hypothesis than of demonstration, entirely overlooked. The common phenomenon made a marvel, and the unexplained phenomenon unnoticed. Both in the eyes of a thoughtful person are equally wonderful; but that point of view is apart from my present object, which is to show that sport trains the eye. As a boy, roving about the hedges with my gun, it was my especial delight to see Mercury, because one of the great astronomers had never seen that planet, and because in all the books it was stated as difficult to see. The planet was favourably situated, and I used to see it constantly after sunset then, pale, and but just outside the sunset glow, only a little way above the distant hills. Now it is curious, to remark in passing, that as the sun sets behind a hill the slope of the hill towards you is often obscured by his light. It appears a luminous misty surface, rosy-tinted, and this luminous mist hides the trees upon it, so that the slope is apparently nothing but a broad sweep of colour; while those hills opposite the sun, even if twice as distant, are so clearly defined that the smallest object is evident upon them. Sometimes, instead of the mist on the western hill, there is a blood-like purple almost startling in its glory of light.