The Green Flash

As the green flash continues to appear in your columns, may I give some limiting observations. At sea I have always seen it, it the horizon is clear and not too red. It is also well seen over distant mountains in Egypt at rising, when the sky is less red than at setting. The horizon may be as near as two miles, and still show traces of a green edge. At any distance less than tIve miles the disappearance can be followed up for some seconds by walking up a slope, so as to keep the green edge under continuous observation.