---

CONTENTS

LIST OF ILLUSTRATIONS

LIFE CONSTANTLY ORIGINATED BY NATURE'S PRODUCTIVE ENERGY

LIFE'S BORDERLAND

THE PLANKTON AND ITS PHOSPHORESCENCE

PRISONERS IN THE DARK AND ICY DEPTHS

THE NATURAL BASIS OF CLASSIFICATION

ANIMAL LIFE IN ORDERLY ARRANGEMENT

JELLYFISHES, NAMESAKES OF THE FABLED MEDUSA

SEA ANEMONES, CORALS, AND SEA FANS

FLATWORMS, FLUKES AND TAPEWORMS

THE COLONIAL MOSS ANIMALS

ANCIENT LAMP SHELLS

STARFISHES, SEA URCHINS, AND TREPANGS

EARTHWORMS AND BEACHWORMS

THE OYSTER AND ITS RELATIVES

MUSSELS, SCALLOPS AND CHITONS

SNAILS AS TYPES OF GASTROPODS

SEA SHELLS IN NATURE AND ART

NAUTILUS, DEVILFISH, AND SQUID

CRABS AND THEIR SMALL RELATIVES

MILLIPEDES AND CENTIPEDES

WEAVERS OF SILKEN TRAPS

THE SPIDERS AND THEIR WEBS

MITES AND TICKS

SOME PRIMITIVE GROUPS

A MUSICAL TRIBE

THE TRUE BUGS

GILDED BUTTERFLIES AND DUSTY MOTHS

FLIES AND THEIR HYGIENIC IMPORTANCE

BEETLES AND THEIR GRUBS

HONEY MAKERS AND PLANT STINGERS

PRIME SIGNIFICANCE OF THE NOTOCHORD

THE ROUNDMOUTHS—LAMPREYS AND HAGS

FISHES WITH PRIMITIVE LUNGS

NEWTS AND SALAMANDERS

FROGS, TOADS AND TADPOLES

FROGS AS NURSERY MAIDS AND WEATHER PROPHETS

THE SOURCES OF TORTOISE SHELL AND TERRAPIN STEW

DINOSAURS—ANCESTORS OF BIRDS

CROCODILES AND ALLIGATORS

LIZARDS AND CHAMELEONS—TURNCOATS OF THE WOODS

ORDINARY SNAKES (COLUBRIDÆ)

CORAL SNAKES, COBRAS, AND SEA SNAKES

VIPERS, MOCCASINS AND RATTLESNAKES

HOW A BIRD IS BUILT

RELICS OF PRIMITIVE TYPES

THE MARSUPIALS

THE EDENTATA—ANTEATERS, SLOTHS, AND ARMADILLOS

SQUIRRELS, WOODCHUCKS AND BEAVERS

RHINOCEROSES, TAPIRS AND HORSES

HIPPOS, PIGS AND CAMELS

CAMELS, DEER, GIRAFFES AND PRONGHORNS

BEARS, DOGS, WOLVES, FOXES AND JACKALS

THE DOG FAMILY—WOLVES, FOXES AND JACKALS

THE SOURCE OF COSTLY FURS

CIVETS, MONGOOSES AND HYENAS

LEMURS, GALAGOS AND AYE-AYES

MARMOSETS, MONKEYS AND BABOONS

GIBBON, CHIMPANZEE, GORILLA, ORANG-UTAN