/ \ DEX 



27 



i: /< !■■ run t 



Nitrogen, a chemical element 



gathered by bacteria . . . 270, 318 



in lipoid 222 



proportion of In living thin. '.• 



Node of corn stem .... 281 

 Nomenclature of plants by 



Linnseus 303 



Non-motile cells (eggs) of 



moss plants 366 



Non-productive persons, 



Dumber i>r 257 



Non-smokers, scholarship of . 229 

 Normal body temperature 



of man 190 



Nose. Bense organ 215 



Notochord, embryonic struc- 

 ture of fishes .... 103, 106 

 Nourishment, defined . . . 1T."» 



in beans 317 



Nuclei of pollen and egg- (tiu r .) 300 



Nucleoli of cells .". 



Nucleus, of cell 268 



of nerve cell 209 



of pleurococcus 339 



Nurses, care of bee larva.* by . :"><> 



Nuthatches, at snet station . 148 



at hemp ami millet station . . I 1 ^ 



destroyers of Lepidopt era . . '.1 



useful birds Ill 



Nutrients, defined 1 



Nuts, from hardwood trees . . 



furnished by walnut family 327 



indebiseent fruits 310 



Nymphs of cicada (fig.) . . 25 



O 



Oak, leaf (fig.) 294 



trees 327 



Oatmeal, value of as food . . 178 



Oats, a cereal (fig.) 326 



a monocotyledon 



map of production of . . . . 324 



member of grass lamik . . . 326 



value of as food 178 



Obelia, classified 6 



microphotograpb of (fig.) • • 86 

 Obnoxious plants, nanus of • 



Octopus, example of mollusk M 



member of cephalopoda ( liu'-i • '•''• , 



Odonata. order of . . 



Odor, use "( in flowers 



Odors, of other f Is absorbed 



by milk 



produced bj fermentation 



Oil, tests for 



Oils, a class of foods . . 

 Old agre. a period in lift- li 

 Olfactory lobes, function ..f 



of frog (fig.) 



One-celled plants . . . 

 Onions, storage •■! food in 

 Operculum of fish . . . 

 Opium, a poison .... 

 Optic lobes oi f p.- nij lis. 



Optic nerve di-. i . . . . 21<>, 

 Oral side of starfish .... 

 Oranges, a form of fruit . . . 



example of berry 



section "i | tii: ) 



value oi as i 1 



Orbits, defined 



Orchard fruits, from I u- 



iiy 



mail of production of . 

 Orchids, greenhouse epiphj 



pollinated by moths .... 

 Org-an. defined 



pa it 1. 1' body 



Organic matter, example of 

 Organism, beginning of Den 



Btudj "I 



Bensat ion in 



Org-ans, of bean ■ • 



of circulation (fig . . 



of cia\ lish 



of earthworm (fig. > . . . . 



of frog (figs.) 1 16, 



Of plants 



Org-an system, defined . 



part "f bod] 



Orioles, food of , • 



nest of ... . 

 Orthoptera. order of Insect! 



Osmometer flg.) 



Osmosis, defined . 



bomemade apparatus for show - 

 log .... 



in absorpt ion »1 i 1 



in photos) uthcsit) 





l 

 II . 



IP' 



in; 



11'' 



JIT 



310 



213 



\ 

 1" 



» 



M 

 117 



t 



1 



142 



