IXDEX 



365 



of, 24 ; food of, 24, 25, 30, 34, 42 ; 

 food chart, 33; methods of bird 

 study and special problems, 35- 

 53 ; migration, 29, 30, 31 ; number 

 needed, 28 ; orders of, 22, 37-53 ; 

 outdoor laboratory work, 25-31 ; 

 plan of course, 23 ; topics for study, 

 31,32; topography of, 37; winter 

 feeding of, 31 ; work suggested, 31 



Bison, 169, 171 



Bitter rot, 210, 212, 213 



Bittersweet, 76 



Bivalves, 274 



Black basses, 309 



Black carpet beetle, 154 



Black cherry, 59, 75 



Black death, 175, 177, 233 



Black flies, 113 



Black gum, 59 



Black knot, 207 



Black mustard, 70 



Black nightshade, 76 



Black rot of cabbage, 212 



Black snakes, 326 



Black walnut, 59, 60, 82, 83 ; pictures 

 of, 61, 66 



Black-and-white warbler, 50 



Blackberry, 94 



Black-billed cuckoo, 46 



Blackbirds, 34, 48 



Blackleg, 248 



Blight, on bean, 215 ; fire blight, 212 ; 

 on pear and apple, 212, 213 ; on 

 potato, 210, 215 



Blister, or oil, beetle, 156 



Blood, good and bad, 344 



Blood-sucking conenose, 154 



Blowfly, 154, 318 



Blowing adder, 326 



Blowing viper, 327 



Blue crabs, 287, 292 



Blue jay, 48 



Blueback salmon, 309 



Bluebird, 49, 51 



Bluebottle, 112, 154 



Bluegill, 299, 306, 307, 309 



Blue-tailed lizard, 325 



Bobolink, 48 



Bobwhite, 34, 41, 42, 53, 332 



Body louse, 154 



Boils, 233, 234, 236, 248 



Bollworm, 156 



Bordeaux mixture, 209, 217 



Borer beetle, 155 



Botflies, 113, 157 



Bovine malaria, 257 



Bovine tuberculosis, 110, 223 



Box tortoise, 324, 325 



Bright' s disease, 232 



Broad-leaf laurel, 75 



Bronchitis, 234, 235 



Bronzed grackle, 48 



Brook trout, 309 



Brooks's law, 291, 292, 308 ; applied to 

 food and game fishes, 308 ; applied 

 to the lobster problem, 286, 291, 292 



Brown creeper, 51 



Brown rot, 207, 210, 211 



Brown thrasher, 51 



Brown-tail moth, 20, 156, 160-162 



Bubonic plague, 2, 107, 175-177, 215, 

 234, 248 



Bugbane, 76 



Bull thistle, 71 



Bullfrogs, 313, 315, 316, 317, 319 



Burdock, 71, 72 



Burrowing rootstocks, 71 



Butter clam, 278 



Butterflies, 153; cabbage, 21, 136-140 



Butternut, 59 



Cabbage, 94, 98 ; black rot of, 212 

 Cabbage butterfly, 21, 136-140; con- 

 trol, 138-140; dispersal, 137; fe- 

 cundity, 136 ; life history, 136-137 ; 

 natural enemies, 136 



