320 



INDEX. 



Ichthydium, sulcatus, 184 

 Impatiens fulva, raphides in, 



306 

 Infusoria, 132 



colors of, 136 

 free-swimming, means 



of movement, 136 

 illoricate, 133 

 in infusion of hay, 132 

 key to genera of, 147 

 loricate, 134 

 parasitic on Hydra, 



170 

 permanently adherent, 



135 

 preservation of, 137 

 structure of, 132 

 to collect, 133, 144 

 to kill for examination, 



137 

 to study, 137 

 water colored by, 159 

 Insects, eggs of, 298 

 eyes, 297 

 feet, 297 



from the cellar, 297 

 . gizzard of, 299 

 proboscides, 298 

 to examine, 299 

 Iodine mixture for killing Infu- 

 soria, 138 

 Iris versicolor, crystal prisms in, 



306 

 Iron, perchloride, for- killing In- 

 fusoria, 138 



K 



Katydid, gizzard of, 299 

 Kerono polyporum, 171 



Key to genera of Algae, 68, loi 

 Desmids, 68 

 Diatoms, 68, 90 

 Entomostraca and 

 Phyllopoda, 264 

 Infusoria, 147 

 Oligochseta, 201 

 Polyzoa, 244 

 Rhizopods, 114 

 Rotifers, 221 

 Statoblasts, 255 

 Water-mites, 285 

 Worms, fresh-wa- 

 ter, 201 

 species of Chietonotus, 181 

 Closterium, 74 

 Mic'rasterias, 77 

 Stentor, 156 

 Keys, analytical, how to use, 67 

 to Chironomus, Chsetono- 

 tus and classes of 

 Worms, 175 



Lacinularia, 221, 222 

 Leguminosse, crystal prisms in, 



306 

 Lemna, 54, 306 



flower of, 55 

 minor, 55 

 polyrrhiza, 54 

 rhaphides in, 306 

 rootlets of, useful to 

 microscopist, 56 

 Lens, Coddington, 6 



pocket, combination, 3 



employment of, 3 

 simple, 2 

 to focus, 7 



