However, fortunately, they got clear and were soon high up above the clouds, with a beautiful blue sky, and the air so pleasantly warm that they needed no extra clothing, as is usually the case when in the upper region of the atmosphere. When they were about four miles high Mr. Glaisher found the beating of his heart become very distinct, his hands and lips turned to a dark bluish colour, and he could hardly read the instruments. Between four and five miles high he felt a kind of sea sickness.