30 
INDEX 
References are to pages 
Reindeer, food of.326 
useful animal.134 
Rejuvenation of worn-out land 394 
Relapsing fever, epidemic dis¬ 
ease .514 
Related forms of conifers 345 
Relation of heredity to human 
progress.535 
Relation of sponge to other 
animals.158 
Relation of vaccination to hu¬ 
man progress ..... 510 
Relationships of plants an in¬ 
teresting study . . . . 378 
Remedies, plants a source of . 376 
Reproduction, a life process . . 5 
asexual, defined.157 
of amoeba . 145 
of bacteria.310 
of fishes.77 
of grasshopper.25 
of hydra.163 
of paramecium.148 
of yeast plant.322 
simplest form of.305 
Reproductive bodies of pteris 334 
Reproductive glands of starfish 170 
Reproductive hyphae of bread 
mold.323 
Reptiles, discussed.99 
life history of.99 
summary of.106 
Reptilia, classified. 9 
number of. 9 
Residents, birds classed as . . Ill 
Resin, source of.346 
Resistance to disease .... 530 
Respiration, a fundamental 
function. 5 
a two-fold process . . : . 146 
described.. 5 
artificial, described .... 448 
in man.443 
organs of ...... 444 
of amoeba.145 
of plants.229 
of grasshopper.21 
of hydra.163 
of mollusk.188 
of paramecium.148 
of starfish.172 
Respiration — Continued 
produces carbonic acid gas 5, 446 
purpose of.5, 446 
student report on ... 444 
Respiration and excretion . . 443 
Rest, effect cf, in consump¬ 
tion . 491 
necessity for, in keeping well 440 
relieves fatigue.440 
Resting stage (pupa) of codling 
moth.27 
Restricted diet of primitive life . 410 
Retina.474 
Review and summary, of assimi¬ 
lation .541 
of cellular structure of organ¬ 
isms .538 
of circulation.541 
of community life .... 544 
of conservation.546 
of Department of Agricul¬ 
ture and Forestry . . . 548 
of digestion.540 
of excretion.542 
of food-getting of animals . . 540 
in plants.540 
of interdependence of animals 
and plants.543 
of living tilings.538 
of natural and artificial selec¬ 
tion .549 
of plant and animal improve¬ 
ment .548 
of principal functions . . . 539 
of protoplasm.538 
of public health ..... 547 
of relation of plants and ani¬ 
mals to man.544 
of reproduction.542 
of respiration.541 
of sensation.542 
Rhizoids, of marchantia . . . 331 
of mosses.328 
Rhubarb, medicinal plant . . 255 
Ribbed stem of parsley family . 300 
Rib of leaf.276 
Rice, amount produced in U. S. 296 
a cereal..244 
member of grass family . . 295 
use of, in China and India . 296 
Rind of corn stem.268 
