TRANSLATOR'S NOTE I THE HARMAS II THE ANTHRAX III ANOTHER PROBER (PERFORATOR) IV LARVAL DIMORPHISM V HEREDITY VI MY SCHOOLING VII THE POND VIII THE CADDIS WORM IX THE GREENBOTTLES X THE GRAY FLESH FLIES XI THE BUMBLEBEE FLY XII MATHEMATICAL MEMORIES: NEWTON'S BINOMIAL THEOREM XIII MATHEMATICAL MEMORIES: MY LITTLE TABLE XIV THE BLUEBOTTLE: THE LAYING XV THE BLUEBOTTLE: THE GRUB XVI A PARASITE OF THE MAGGOT XVII RECOLLECTIONS OF CHILDHOOD XVIII INSECTS AND MUSHROOMS XIX A MEMORABLE LESSON XX INDUSTRIAL CHEMISTRY