INDEX 



617 



lifo habits of, 59 



relation to diseaso, 021 



relation to free nitrogen, oO-CiO 



spores of, 16(5 



structure of, 165-166 

 Bacterial infections of plants, 579 

 Bacterins and their use, 630 

 Bacteriophage, 627 

 Bacterium, 71 

 Baird, 7 



Balancing organ, crustacean, 372 

 Balanoglossus, 105 

 Balanus, 500 

 Balkans, 561 

 Banting, 296, 397 

 Bark, 247, 248 

 Barnacles, 99, 500 

 Barrell, estimate of geological time by, 



553, 554 

 Barriers 



biological, 32, 533 



chemico-physical, 30 



geographical, 31, 523 



mountain, 30 

 Basic environments, 7 

 Basidiomycetes, 73 

 Bateson, experiments of with sweet 



peas, 451 

 Bats, 115, 534 



specialization of wing, 544 

 Bauhin, Kasper, 64 

 Bayliss, 392 



"Beagle," voyage of, 508, 518 

 Bean, Professor 



estimate of age of flints by, 547 



estimate of geological time bv, 553 

 Bears, 385, 509 

 Bee 



head of worker, £04 



mcjuth parts, 203-;^0.5 

 Beebe, William, 22, 27 

 Beetles, 101 



Bergson, theory of evolution of, 527 

 Behavior, definition of, 366 

 Behavior patterns, 381-382 

 Behaviors, as adaptive responses, 380- 



381 

 Belly, of muscle, 338 

 Benedict, 312 

 Berbers, 561 

 Bering Sea, 511 

 Bering Strait, 509 

 Bernard, Claude, 391 

 Berthold. A. A., 391 

 Best, 296, 397 

 Biceps, 338 

 Biennials, 240 



Bilateral symmetry, evolution of, 532 

 Bile, 296 



H. w, H.— 42 



Binary fission, 41 1 



Anieba, 155 



Paramecium, 160 

 Binomial nomenclature, 63, 64, 65 

 liiogenetic Law, 501 

 Biological surveys, 603 

 Biometrv, 440 

 Birds, 103, 113 



economic value of, 577-578 



embryological adaF)tati(>ns in, 487 



evolution in, 532 



hearts of, 497 



in mesozoic era, 452 



in recapitulation theory, 501 



insect eating, 578 



physical adaptations in, 491 



relation of blood to other animals, 

 514 



rise of in evolution, 513 



seed-eating, 578 



sex inheritance in, 468 



species of lice on, 524 

 Bison 



distribution of, 509 



La Brea fossils of, 477 

 Blackberry, white, 455 

 Black stem grain rust, 57 

 Bladderwort, leaf of, 54 

 Blastocoel, 418 

 Blastoderm, 417 

 Blastomeres, 432 

 Blastopore, 4^0 

 Blastostvle, Obelia, 186 

 Blastula, 418 



earthworm, 197 

 Blastulation, 418 

 Blind spot, 359 

 Blood 



earthworm, 191-192 



insects, 210 



transportation of in vertebrates, 233 

 Blood platelets, 302-303 

 Blood sinuses, bee, 209 

 Blood sugar raising principle, 401 

 Blood vessels, earthworm, 190-191 

 Body cavity, 426 

 Body parts, insect, 200 

 Body surface, respiration, 314 

 Body wall, insect, 2^2-203 

 Bolus, 290 



Bombinator (toad), biological adapta- 

 tions in, 492-493 

 Bones, ankle, 332 



cartilaginous, 329 



cranial, 330 



facial, 330 



membrane, 329 



metacarpal, 332 



metatarsal, 3S2 



