430 INDEX AND GLOSSARY. 



Softening of brain, 235. 



Sort, 155. Fructifying spots of ferns. 

 Soda, 115. 



Side reflector, 37. 



Simple microscope, 21. 



Smut, 136. A species of fungus. 



Sperm-cell ', 125. A synonym for sperraatozoid. 



Spectrum Analysis. 101. Analysis by means of the spectro- 

 scope. 



Spiral Motion, 130. From progression of the centripetal 

 point in space. 



Spiral Vessels, 131. A spiral deposit in ducts of plants. 



Spot lens, 36. 



Sphagnum, 155. Bog-moss. 



Spherical Aberration, 22. Errors in lenses from spherical 

 shape of surface. 



Sphceroplea, 152. A species of Cryptogamous plants. 



Sponges, 160. Poriferous Rhizopods. Some form of them 

 a sub-class, Polystornata. 



Spontaneous Generation, 125. The theory of life without 

 parentage. 



Spring clips, 80. 



Spiders, 179. Class Arachnida. 



Spermatozoids, 201, 214, 311. The male elements of im- 

 pregnation. 



Splanchnopleure, 203. An embryonic layer forming the wall 

 of the intestinal canal. 



Sporangia, 154. Spore-cases of Cryptogams. 



Spinal cord, 216. 

 " nerves, 216. 



Splenic fever, 297. 



Spirilla 297, 328. Screw bacteria. 



Sputum, 316. Discharges from the mouth. 



Specific gravity of urine, 301. 



Stage micrometer, 38. 



Staining cells, 122. 

 " tissues, 63. 

 " fluids, 69. 



Starch, 132. 



Stems of plants, 156. 



