i \ Di:\ 



Referenc* a ><>■■ to pa 



Biology, defined 1 



of disease 232 



Birch roots, photograph ol 



(fig.) 392 



Bird house, plan for (fig.) . . lis 



Birds, characteristics of . . . L36 



classified 7 



economic importance of . . . Ill 



number of 7 



summary of 149 



Birds' feet, different kinds of 



(rig.) 139 



Bitter, a fundamental taste . . 165 



Bittern, beak of 137 



nest of 14'J 



Bivalves, reason for name . . 98 



Blackberry, in plant succession 4(H) 



receptacle of fruit eaten . . 



Blackbirds, food of 



31, 



310 



14.") 

 132 

 207 



294 

 257 

 197 



Black snake, a constrictor . 



Bladder 



Blade of bean leaf . . . 



of leaf, food storage in . . 

 Blind persons, number of . 

 Blood, corpuscles .... 



of man 197 



plasma 197 



student report on '200 



vessels, function of .... :'. 



Bluebird, a beneficial bird . . 144 



destroyed by hawks .... 145 



destroyer of Lepidopt era . . 31 



food of '-"J 



Blue jay, at bread crumb sta- 

 tion 14S 



at suet station 148 



at whole grain station . . . 14'.i 



feeds on larva; of Lepidqptera 31 



Blue racer, a constrictor . . . 132 



Boa-constrictor 132 



Boards of health 246 



Bobolink, female (tig.) ... 1 16 



food of 11" 



migratory habits of . . . 143 



nesting habits of in 



Body, parts of I 



Body cavity of earthworm . 81 



Body temperature, of birds . 138 



of mammals 150 



of man 190 



Bone, microphotograpb of (flg.) 



Bt rucl ure of ( t\g i 



Bony fishes, list of 



Borax, a preservative .... 

 Borers, harmful beetles . . . 



eaten by downy \\ oodpecker 

 Boric acid, a preservative 

 Botfly, harmful Insect .... 

 Bottling-, good and bad (fig I 

 Bougainvillea hydroid [fig 

 Bracket fung-i, ctT.-ct on trees 

 Bracket fung-us (tiu r ) . . . . 

 Brain, conl rol (fig.) 



efficiency, discussion of . . . 

 conditions Decessarj for . . 



microphotograpb of ( fig > 

 " Brain " of earthworm . . 



Braincase 



Bran, used as an adulterant . . 



Branch, example of organ 



Branch infected with mis- 

 tletoe (fig.) 



Bread, crumbs for feeding station 



mold ( fig. ) 



laboratory study of . . . 

 rye, \ alue of as food .... 

 use of yeast in making 



wheat , value id as food . 

 Bread-making, scientific Ka^is 

 of 



temporary by-products of . . 

 Breathing, in grasshopper . . 



in man 



not respiration 



Breathing center in develop- 

 ing embryo 



Brewing, scientific basis of . . 



Bronchus 



Brook trout ( i'il: > 



raised in hatcheries .... 



Brown bat (fig.) 



Brown creeper, at bread 

 crumb Btat ion 



at suet stat ion 



1 1 of 



Brown hydra 



Browntuil moths 



Bryophytes clussitlod . , 



Bubbles of oxygen in masses 



of spirogyra 



106 



111 

 11 



218 

 212 



- ■ 



lis 



IIS 



. U * i 



17s 



• 



17s 



11 

 l'.'l 



22 1 



ll Hi 

 111 



152 



lis 

 lis 



111 



I 



•JO 



