12 



INDEX 



References are to pages 



Digestion, continued 



of food by pleuroeoccus . . . 



of food in seed 



Digestive fluids, of man . . . 



of starfish 



Digestive organs, of crayfish 



of man, summary of . . 161, 

 Digestive system of animals, 

 student report on .... 

 Digestive tube of clam (fig.) 

 Dill, member of parsley family . 

 Dioecious flower, defined . . 

 Diphtheria (germ disease) . 197, 



antitoxin 197, 



thirty years of in N. Y. state 



(fig-) 



treatment of 



Diptera (order of insects) . . 



described 



Direct heating (fig.) .... 

 Dirty barns, milk from . . . 

 Dirty milk, bacteria in (fig.) . 



Disease, cause of 



of beans (bean blight) . . . 

 of plants, necessity for know- 

 ing 320, 



of respiratory tract .... 



results of 



student report on 



summary of 



Diseases caused by abnormal 



growth of tissues .... 



caused by bacteria .... 



by plants or animals . . . 



by poisons, list of .... 



Disinfectants 



Disinfection 



Disk, central, of starfish . . . 



sucking, of starfish .... 



Disk-flowers of composites . 



Dissected leaves of crowfoot 



family 



Distribution of plants .... 



of plant products, an industry 



of seeds, agencies for .... 



of seeds by animals .... 



by pappus and hooks . . . 



by water 



from milkweed (fig.) . . . 

 necessity for 



339 

 266 

 171 



72 



89 



182 



164 

 95 



329 

 299 

 234 

 252 



242 

 252 

 20 

 41 

 197 

 348 

 319 

 232 

 315 



402 

 197 

 254 

 256 



258 



233 

 401 

 233 

 232 

 253 

 253 

 71 

 73 

 334 



328 

 399 

 401 

 312 

 313 

 389 

 313 

 313 

 311 



Dividing cells of pleurococ- 

 cus 



Dividing egg, becoming tadpole 



(fig.) 



of frog (fig.) 



Division of labor 



in man 



in sponge 



in volvox 



Dodder, twining stem of (fig.) . 



Dog, skeleton of (fig.) .... 



Dogtooth violet, stems of . . 



Dorsal blood vessel of earth- 

 worm 



Dorsal surface of earthworm 



Dough in bread making . . 



Douglas fir. economic value of 



Downy woodpecker, a perma- 

 nent resident 



food of 



Dragon flies, enemies of mos- 

 quito 



member of Odonata .... 



Dredging, necessity of . . . 



Drills, a method of planting . . 



Drink, impairment of scholar- 

 ship by (fig.) 



skill and endurance impaired 

 oy (fig.) 



Drink and assaults (fig.) . . 



Drones (bees) 



Drowning, a form of suffocation 



Drupes, defined 



Dry beans, ability of to grow . 



Dry fruits, bean an example of 



Drying, protection of bacteria 

 from 



Drying fruit, purpose of . . . 



Dry season, effect of on annual 

 ring 



Dry seasons, effect of, on size 

 of cells . . 



Ducks, feet of 



E 



339 



122 



122 



56 



164 



57 

 56 



288 

 150 



285 



82 



80 



179 



385 



141 

 144 



42 



20 

 387 

 402 



221 



219 

 222 

 35 

 196 

 310 

 264 

 310 



345 

 347 



290 



Eagle, a scavenger 

 claws of ... 

 head of (fig.) . . 

 wings of . . . 



378 

 137 



147 

 137 

 140 

 136 



