The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 51
... killed , while some spores will survive dry heat of 140 ° C. , though they are killed by exposure for thirty minutes to moist heat of 120 ° C. A few varieties thrive best near the freezing point and a few others whose optimum is between ...
... killed , while some spores will survive dry heat of 140 ° C. , though they are killed by exposure for thirty minutes to moist heat of 120 ° C. A few varieties thrive best near the freezing point and a few others whose optimum is between ...
الصفحة 53
... killed by exposure to the sunlight . Few germs survive in the bright sunlight of arid regions . Animals vary in their re- actions to light . Owls can see by day but prefer to hunt by night . In ponds the snails seek a faint light ...
... killed by exposure to the sunlight . Few germs survive in the bright sunlight of arid regions . Animals vary in their re- actions to light . Owls can see by day but prefer to hunt by night . In ponds the snails seek a faint light ...
الصفحة 56
... killed . The fumes from a smelter may destroy the vegetation for miles . Butte , Montana , once bore the reputa- tion of having neither lawns nor trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe ...
... killed . The fumes from a smelter may destroy the vegetation for miles . Butte , Montana , once bore the reputa- tion of having neither lawns nor trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe ...
الصفحة 58
... kill them . They must be fat when they begin the long sleep and must waken gradually . It is believed that if their temperature falls too low they awaken automatically , and by movement and the inhalation of oxygen again raise their ...
... kill them . They must be fat when they begin the long sleep and must waken gradually . It is believed that if their temperature falls too low they awaken automatically , and by movement and the inhalation of oxygen again raise their ...
الصفحة 88
... killed by direct exposure to the sun , the short rays being most fatal to them . Few bacteria attack the living tissues of plants or animals . All animals must get their food by breaking down the compounds prepared by green plants ...
... killed by direct exposure to the sun , the short rays being most fatal to them . Few bacteria attack the living tissues of plants or animals . All animals must get their food by breaking down the compounds prepared by green plants ...
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acres Africa alloy America appears areas Asia atoms average bacteria birds black bass body carbon carbon dioxide cattle cause cells Cenozoic cent century changes chemical chlorophyll climate coal common compounds crops cultivated culture death rate destroy disease distribution domestic animals early earth eaten eggs elements enemies Europe evidence fact fish forms germ germ cells hawk heat horse human hydrogen Ibid important increase Indian insects iron killed known land later light live man's metals mice migration miles moth native nature neolithic nitrogen ocean organisms oxygen Pará rubber tree parasites plants and animals population pounds produce protoplasm R. S. LULL race regions rodents season seeds seems sharp-shinned hawk sheep soil South South America species square mile substances sugar supply surface survive tarpan temperature thousand tion to-day trees tropics types United wild