The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة xi
... Mice 139 Rats 139 Difficulties of Pest Control 140 Effects of Bird Destruction 140 Unsatisfactory Remedies 141 Rabbits 142 Cats 143 Disease 143 Needless Slaughter 144 Bird Protection 144 Man versus Insects 145 Insect Societies Summary ...
... Mice 139 Rats 139 Difficulties of Pest Control 140 Effects of Bird Destruction 140 Unsatisfactory Remedies 141 Rabbits 142 Cats 143 Disease 143 Needless Slaughter 144 Bird Protection 144 Man versus Insects 145 Insect Societies Summary ...
الصفحة 97
... mice . " Thus we may say with Darwin that next year's crop of purple clover is influenced by the number of humble bees in the district , which varies with the number of the field mice , that is to say with the number of cats.3 ...
... mice . " Thus we may say with Darwin that next year's crop of purple clover is influenced by the number of humble bees in the district , which varies with the number of the field mice , that is to say with the number of cats.3 ...
الصفحة 101
... mice epidemics in Nevada in 1907 and in California during the winter of 1926-1927 will be long re- membered . Such an increase inevitably attracts the enemies of the increased species until an equilibrium is again at- tained . " In this ...
... mice epidemics in Nevada in 1907 and in California during the winter of 1926-1927 will be long re- membered . Such an increase inevitably attracts the enemies of the increased species until an equilibrium is again at- tained . " In this ...
الصفحة 111
... mice and men Gang aft a - gley , And lea'e us nought but grief and pain , For promised joy . -BURNS MAN UPSETS THE BALANCE OF NATURE Actually as well as potentially the greatest threat to the maintenance of the " balance of nature ...
... mice and men Gang aft a - gley , And lea'e us nought but grief and pain , For promised joy . -BURNS MAN UPSETS THE BALANCE OF NATURE Actually as well as potentially the greatest threat to the maintenance of the " balance of nature ...
الصفحة 118
... mice and other small game . Yet , we kill the garter snake and the black snake almost as quickly as the dangerous sorts . But the black snake is harmless and is the deadly enemy of the rattlesnake which it kills whenever it meets it ...
... mice and other small game . Yet , we kill the garter snake and the black snake almost as quickly as the dangerous sorts . But the black snake is harmless and is the deadly enemy of the rattlesnake which it kills whenever it meets it ...
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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