322 



INDEX. 



N 



Nais, 202, 211 



Natural history; pleasure of 



studying, 295 

 Navicula, 91 



cuspidata, 96 

 Needles, dissecting, 31 

 Nerium Oleander, stomala of, 



303 



sphsEraphides of, 306 

 Note-book, importance of, 38 

 Nuphar, 49 

 NymphEea odorata, 48 



O 



Objectives, American, 13 

 care of, 14 

 field of, 294 

 French triplet, 11 

 modern American, 13 

 one-fifth preferred to 



one-fourth, 17 

 Students' series, 17 

 to be selected by be- 

 ginner, 15 

 to focus, 18 

 why so named, 8 

 Objects, opaque, 294 



to mount dry, 30 



to mount microscopical, 



24, 25 

 to prepare microscope 

 for examination of, 

 23, 294 

 transparent, 294 

 worth examining, some 

 common, 292 

 Ocnerodrilus, 201, 208 

 Odontophore of mollusks, 301 



Qicistes, 221, 225 

 CEnothera, raphides in, 306 

 Oleander, sphseraphides, in 306 



stomata, 303 

 Oligochaeta, 176, 198 



beneath decaying bark, 



203 

 blood of, 200 

 bristles of, 173, 198 

 fluid in body cavity, 200 

 food, 200 

 habitats, 174 

 key to genera, 201 

 mouth and alimentary 



canal, 199 

 podal spines, 173, 198 

 reproduction, 200 

 Onion, crystal prisms in,. 306 

 Orontium aquaticum, rhaphides 



in, 306 

 Oscillaria, 102, 103 

 Oxalis, sphseraphides, 307 



Packard, Dr. A. A., on Branchi- 

 pus, 278 



on Phyllopod cru.stacea, 

 278 

 Paliudicella, 244, 249 

 Paramsecium, 148, 162 

 Passion-flower, 304 

 Paste-eels, 198 

 Pectinatella, 240, 241, 244 



statoblasts, 252, 256 

 Pediastrum, 68, 98 



Boryanum, 98 

 Penium, 72, 84 



Brebissonii, 85 

 Phacus, 148, 160 



