Index 



A Study of History, 87 



Acrasiaceae, 72-73 



Adaptation, in hereditary changes, 



40-41 

 Africa, birth rates in, 241 

 Agriculture, 96-97, 243-44 

 Akeley, Carl E., 73 

 Allee, W. C, 70-72, 74, 78, 218 

 Alpert, Augusta, tests, 162 

 Altruism 



among animals, 82-83 



in man, 85 



weakness of, 219 

 Amino acids, 27-28, 34 

 Amnion, 52 

 Amphibian, 52 

 Amphioxus, brain of, 128 

 Andromeda Nebula, resolved, 1924, 



16 

 Animal and plant progression, 



44-55 

 Animals, development of mind in, 



120-35 

 Annelid— arthropod line, 51 

 Annelid worms, 49 



sense of timing, 126 



two-part brain, 124-25 

 Anthropoids, link to, 59-60 

 Ants, 127 



agricultural, 145 



behavior of, 143-47 



caste system of, 81-82 



division of labor in, 143-44 



food-getting in, 144 



grain collectors, 145 



honey pots, 145-46 



lolling, 147 



slaves of, 146 



war on other ants, 147 

 Ape-man, 61, 89-90; see also 



Primates 

 Apes, 91, 134 

 Apes, great, 55 

 Aristotle, 221 



Arithmetic machine, of Pascal, 173 

 Arthropods, 49, 54, 127 

 Asia, birth rates in, 241 

 Australopithecines, 60-61, 63 

 Australopithecus africanus, 60-61 

 Automation, 248 



Baboons, organization of, 55, 79 



Balanced society, the goal of man, 

 249 



Balanoglossus, 50 



Barnett, Lincoln, 22 



Bass, cannibalism of, 73 



Bees 



behavior of, 148-57 

 bumblebees, life of, 148-49 

 capable of concept formation, 



157 

 caste system of, 80-81 

 language of, 153-57, 168 

 scout bees, 153-57 

 sense organs of, 152-56 

 stylized dance of, 154-56 



Bees, Their Vision, Chei?tical 

 Senses, aiid Language, 150 



Beetles, lady, 75 



265 



