450 



INDEX 



(fig.)> 79, 82 ; of Brown Algae 

 202 ; of Conifers, 341 (fig.). 



Sieve tubes, function of, 28, 88 ; of 

 Angiosperms, 28, 29 (fig.), 80 

 (fig.), 82, 85 (fig.) ; of aquatics, 

 171, 174 (fig.) ; of Conifers, 

 339, 34, 34i (fig-) ; of Ferns, 

 292 (fig.), 293 (fig.) ; of second- 

 ary phloem of Dicotyledons, 

 121 (fig.), 130. 



Sigillaria, 314 (fig.). 



Siliceous deposits due to Diatoms, 

 207. 



Silicification of cell-wall, 39, 206. 



Silicified hairs, 104. 



Silk-Cotton Tree (Eriodendron an- 

 fractuosum), 103. 



Silkworm disease, 230. 



Silver Goosefoot (Obione portula- 

 coides), 94 (fig.), 133; Fir 

 (Abies), 335, 336 (fig.), 344, 347. 



Silver Leaf Disease of Plum (Stereum 

 purpureum), 250, 252. 



Silverweed (Potentilla anserina) , 102. 



Simple pits, 30 (fig.), 33, 121, 122, 

 276. 



Sinigrin, 48. 



Skeletal tissues, 31-6 (figs.), 72, 



87, US- 



Skin-diseases due to Fungi, 253. 

 Sleep-movements, 115. 

 Slime-Fungi (Myxomycetes), 250, 



251, 406. 



Smuts (Ustilagineae), 230, 245, 248, 



252, 407. 

 Soap, 50. 



Soapwort (Saponarid), 48. 



Soft rot of Carrots (Bacillus caro- 

 tovorus), 265. 



Soft rubber, 157 ; wood, 127. 



Soil Algae, 798, 204, 208, 216 ; 

 Bacteria, 266, 267 (fig.). 



Soil-differences and plant-distribu- 

 tion, 391. 



Soja-beans (Glycine), 49. 



Solanaceae, 58, 60, 61, 81. 



Solitary crystals, 58, 59 (fig.). 



Soredia (of Lichens), 260 (fig.), 261. 



Sorrel, Wood- (Oxalis acetosella), 95. 



Sori (of Ferns), 291 (fig.), 295, 296 



(fig.), 297 (fig-)- 

 " Souring '' of milk, 265. 

 Space-parasites, 260. 

 Spartium junceum, proembrvo of, 



37i (fig-)- 



Spawn (of Mushrooms), 248. 

 Spermatozoid mother-cells, 277, 278 



(fig.), 302, 303 (fig.), 3195 



Spermatozoids, 220, 236, 330, 333 ; 



of Algae, 220, 221 (fig.), 222, 



224, 225 ; of Cycads, 326, 327 



(fig.) ; of Ferns, 302, 303 (fig.) ; 



of Liverworts, 277, 278 (fig.) ; 



of Mosses, 280 ; of Selaginella, 



319, 320 (fig.). 

 Spermogonia (of Rusts), 246 (fig.), 



247. 

 Sphacelaria, growing point of 16 



(fig.), 17- 

 Sphaerella (Hesmatococcus), 186 187 



(fig.)- 



Sphaerotheca castagnei, 244 (fig.) ; 

 5. mors-uvce, 243 ; 5. pannosa, 



243. 



Sphagnales, 407. 

 Sphagnum, 274, 275 (fig.), 276. 

 Sphenophyllales, 407. 

 Sphenopteris hoeninghausii, 329-(fig.). 

 Sphere-crystals (of inulin), 44, 45 



(fig.). 



Spices, 62. 



Spiderwort (Tradescantia) , cell- 

 structure of, 4, 5 (fig.). 



Spinach (Spinacia oleracea], stem 

 of, 86. 



Spinach-family (Chenopodiaceae), 

 secondary thickening in, 133. 



Spindle-fibres, 23 (fig.), 24, 25 (fig.) 



Spindle- tree (Euonymus europ&us}, 

 139, 359. 



Spircea ulmaria, 169. 



Spiral flowers, 354 ; tracheids, 37 

 (fig.), 113, 293, 340 ; vessels, 

 35 (fig.), 36, 68, 80. (fig.), 83 

 (fig.), 89, 172. 



Spireme, 21 (fig.), 22. 



Spirillum, 262, 263 (fig.) ; S, 

 rubrum, 263 (fig.). 



Spirogyra, 16, 195, 307 ; cell- 

 structure of, 7 (fig.), 208 ; 

 filaments of, 195, 197, 210 ; 

 fragmentation of, 216 ; sexual 

 reproduction (conjugation) of, 

 226-8 (fig.). 



Spirogyra bellis, 227 (fig.) ; S. webcri 



227 (fig.). 



Sponges, " green cells " of, 260. 



Spongy parenchyma, 38 (fig.), 92 

 (fig.), 107, 108 (fig.), 109 (fig.), 

 110; function of, 107, no ; of 

 shade-leaves, 170. 



Sporangia of, Algae, 218, 228 ; 

 Conifers, 345 - 8 (figs.) ; 

 Cycads, 323-6 (figs.), Equise- 

 tum, 312, 313 (fig.) ; Ferns, 

 295-3 (figs.), 33, 38, 39 



