Page:Travels to Discover the Source of the Nile - In the Years 1768, 1769, 1770, 1771, 1772, and 1773 volume 4.djvu/510

 say hot, some other explanation is necessary concerning the place where we are, in order to give an adequate idea of the sensations of that heat upon the body, and the effects of it upon the lungs. The degree of the thermometer conveys this very imperfectly; 90° is excessively hot at Loheia in Arabia Felix, and yet the latitude of Loheia is but 15°, whereas 90° at Sennaar is, as to sense, only warm although Sennaar, as we have said, is in lat. 13°.

At Sennaar, then, I call it cold, when one, fully cloathed and at rest, feels himself in want of fire. I call it cool, when one, fully cloathed and at rest, feels he could bear more covering all over, or in part, more than he has then on. I call it temperate, when a man, so cloathed and at rest, feels no such want, and can take moderate exercise, such as walking about a room without sweating. I call it warm, when a man, so cloathed, does not sweat when at rest, but, upon moderate motion, sweats, and again cools. I call it hot, when a man sweats at rest, and excessively on moderate motion. I call it very hot, when a man, with thin or little cloathing, sweats much though at rest. I call it excessive hot, when a man, in his shirt, at rest, sweats excessively, when all motion is painful, and the knees feel feeble as if after a fever; I call it extreme hot, when the strength fails, a disposition to faint comes on, a straitness is found in the temples, as if a small cord was drawn tight around the head, the voice impaired, the skin dry, and the head seems more than ordinary large and light. This, I apprehend, denotes death at hand, as we have seen in the instance of Imhanzara, in our journey to Teawa; but, this is rarely or never effected by the sun alone, without the addition of that poisonous wind which pursued us through Atbara, and will be more particularly described in our