INDEX AND GLOSSARY. 425 



Nostochinee, 151, 322. A family of Confervoid Algae. 



Notochord, 203. The gelatinous column forming the pri- 

 mary state of spine in vertebrates, 



Nucleus of Cells, 119. New centres of living matter. 



Nutritive organs, 206. 



Numbering blood-corpuscles, 296. 



Oberhauser's drawing apparatus, 39. 



'Object glasses, 25. 

 " finders, 48, 



Oblique Illumination, 34. Light thrown obliquely through 

 an object. 



Ocular micrometer, 38, 296. 



Ocelli, 176. Facets of compound eyes of insects. 



(Ecoid, 188. A constituent of the red blood-corpuscle. 



Octospores, 153. Subdivisions of sporangia in certain 

 Algae. 



Oidium Albicans, 329. Thrush-fungus. 



Oil of cloves, 68, 80. 



Oolites, 90. Kocks whose structure resembles eggs of fish. 



Oospores, 152. Reproductive cells of Oscillatoria. 



Operculum, 154. The lid of spore- capsules in mosses, etc. 



Opaque injections, 65, 70. 

 " objects, 77. 



Orbitalites, 159. Foraminiferous shells in limestone. 



Organic principles, 183. Formative materials. 



Organization after inflammation, 261. 



Organ of Corti, 223. A complicate apparatus in the inner 

 ear. 



Organs of special sense, 218. 



Origin of rocks, 92. 



Oscillatoriae, 151. A family of Confervoid Algae. 



Osmic acid, 70. 



Osseous tissue, 195. Bone. 



Osteoblasts, 196. Cells developing bone. 



Osteoma, 278. An osseous tumor. 



Osteocho?idroma, 278. An ossifying enchondroma. 



Ovum, 201. Egg. 



Ovary, 214. Essential organ of reproduction in the female. 



Ovipositors, 177. 



