The culminating day should not be allowed to pass without another tribute to the efficiency of the amber glasses. Notwithstanding the glare of the sun at twenty thousand feet and upward, no one had the slightest irritation of the eyes. There has never been an April of travel on the Yukon in eight years that the writer has not suffered from inflammation of the eyes despite the darkest smoke-colored glasses that could be procured. A naked candle at a road-house would give a stab of pain every time the eyes encountered it, and reading would become almost impossible. The amber glasses, however, while leaving vision almost as bright as without them, filter out the rays that cause the irritation and afford perfect protection against the consequences of sun and glare. There is only one improvement to make in the amber glasses, and that is some device of air-tight cells that shall prevent them from fogging when the cold on the outside of the glass condenses the moisture of perspiration on the inside of the glass. We use double-glazed sashes with an air space between on all windows in our houses in Alaska and find ourselves no longer incommoded by frost on the panes; some adaptation of this principle should be within the skill of the optician and would remove a very troublesome defect in all snow-glasses. If some one would invent a preventive against shortness of breath as efficient as amber glasses are against snow-blindness, climbing at great altitudes would lose all its terrors for one mountaineer. So far as it was possible to judge, no other member of the party was near his altitude limit. There seemed no reason why Karstens and Walter in particular should not go another ten thousand feet, were there a mountain in the world ten thousand feet higher than Denali, but the writer knows that he himself could not have gone much higher. FOOTNOTE: