ixi)i:x 



21 



/,' f{ rerun a 



Hydrastis, source of ... . 327 

 Hydrochloric acid in arti- 

 ficial gastric juice . . . 173 

 Hydrogen, proportion of in 



plants and animals .... 8 



Hydroid. bougainvillea (fig.) »>o' 



colony thai Looks like a plant 



(fig.) 67 



medusa (fig.) . . » .7 



obelia microphotograph of 



(fig.) 66 



Hydroids, described .... <;<; 



examples of coelenterates . • 63 



Hydrophytes, definition <>f . . 394 



finely divided Leaves of sub- 

 merged forms 394 



waterlilies (rig.) 393 



Hydrotropism, detined . . . 284 



in roots 284 



Hydrozoa, classified .... 6 



Hymenoptera, discussed . . :'«l 



order of insects 20 



Hyphae of bread mold . . . .V>7 



Hypocotyl. pari of embryo . . •"• || i 



part to grow first 261 



use of, to embryo 261 



I 



Ice, a form of water .... 9 



use of , in caring for milk . . .".is 



Ice cream, dangers from . . . 350 



manufacture of 350 



Ichneumon flies laying eggs 



in trees (fig.) W 



Ichneumons, discussed . . . 39 

 enemy of Lepidoptera . . . . 28 

 members of order Hymenop- 

 tera .... 20 



Imbecility 232 



Immunity 26S 



denned 251 



Immunization 'S<- 



Imperfect flower, kinds . . 302 



of corn 298 



Improvement of plants, 



methods of W2 



Incisor teeth 166 



Incomplete flower, part lack- 

 ing in $•- 



/" pages 



Incomplete metamorphosis 



ol tree cricket (fig.) 

 Indehiscent lr . 

 Independence of plan 

 Independent existence 

 moss gametophyte . 

 India, dependence "n i . 



Indian pipe 



Indians, use <>f beans bj . 



environment of . 



of 



Indigestion 



causes of 



tablets for 



Indirect heating (fig.) ■ . . 



Indistinct ring.left by bud scales 

 produced by droughl .... 



Inefficiency, caused !>y tempo- 

 re iv sickness 



Influence of alcohol on de- 

 velopment of brain . . 



Infusoria 



Inlnilent pores 



Inhalent siphon of clam . . . 



Inhalers 



Inherited diseases .... 



Inner chamber of eye ui. 



Inner coat of pollen grain 



Inner ear (tig.) .... JIT, 



Inoculation 



Inorganic foods 



Inorganic matter 



Insanity 



16 



17 



••1 



1.7 

 180 



181 

 196 





Insect, group, divisons of 



pollination 



\ Lsitors, Btudj of 



Insecta 



Insect enemies of bean plant 

 Insects, acti\ [ties of . . . . 



carriers of bacteria . . . . 



de\ ices for attracting . . . . 



examples of Arthmpoda 



field study of 



life bistorj "i 



nhjeet iii \ isit tng tl"\\ en 

 Inspection of meat 

 Inspiration, defined 

 Insulation of nerve ftbei 

 Integument, development 



of bean 



of o\ ales 



M 



172 

 10 



\\i 



12 



194 

 301 



• 



