[PUPA-CASE, LARVA, AND FLY OF CADDIS-WORM] 169

[MINNOW] 170

[SMOOTH NEWT] 171

[METAMORPHOSES OF NEWT] 172

[WATER-FLEAS AND ANIMALCULÆ IN DROP OF WATER AS SEEN UNDER THE MICROSCOPE] 173

[FRESH-WATER AQUARIUM] 174

[METAMORPHOSES OF FROG] 175

[SEA-WATER AQUARIUM] 176

[WALL SPLEENWORT] 177

[FORKED SPLEENWORT] 177