of the American Academy Of Arts and Sciences, and in 1876 a fellow of the Natural Academy Of Sciences. He is also a member of the American Association For The Advancement Of Science, and of the American Philosophical Society. From 1883 to 1886 he was president of the American Ornithologists Union. He is the author of numerous reports and scientific papers among which are On Geographical Variation In Color Among North And American Squirrels (1874) to History Of North American Pinnipeds, A Monograph Of The Walruses, Sea Lions, Sea Bears And Seals Of North America (1880). Allens rule is a rule that states that among endotherms, populations of the same species living near the equator tend to have more protruding body parts and longer limbs than do populations farther away from the equator.The Bergmann rule and Allan rule can be compared by demonstrating the information that these two rules come together as Bergmann and Allan came together to collaborate and find the following data. Adapting to a hot environment is as complex as adapting top a cold environment. However, cold adaptation is usually more difficult physiologically for human nature. We do not grow dense fur coats nor do we usually have thick layers of fat insulation like polar bears. The effect of heat on our bodies varies with the relative humidity of the air. High temperatures with high humidity makes it harder to lose excess body heat. This is due to the fact that when the moisture content of air goes up, it becomes increasingly more difficult for sweat to evaporate. The sweat stays on our skin and we feel clammy. As a result, we do not get the cooling effect of rapid evaporation, The dry hot weather humidity is low and sweat evaporates readily. As a result, we usually feel reasonably comfortable in deserts at temperatures that are unbearable in tropical rain forests. The higher the desert temperatures, the more significant of a cooling effect we get from evaporation. This re...
