636 



INDEX 



Rhizoctonia, 291, 293 

 Rhizomes, 150 

 Rhubarb, 116 

 Ribes, 301 

 Riccia, 222 



fluitans, 209 



life history of, 224 



natans, 209 



trichocarpa, 222 

 Ricciales, 210 

 Ricciocarpus, 223 

 Ricinus, 123 



communis, 63, 66 

 Robinia, 467 



Rock strata, classification of, 583 

 Root, 10 



elongation of, 117 

 Root-cap, so 

 Root-hairs, 11, S3) 54) S8 



and soil, relation between, 52 



importance of, 49 



location of, 49 



structure of, 51 

 Root-nodules, 83 ^ 



of Cycas revolutia, 333 

 Root-stocks, 150 

 Rosa Carolina, 464 



■ rugosa, 450 

 RosacesB, 464 

 Rose, 465 



wild, 466 

 Rosette, 40 

 Rostellum, 501 

 Rotation of crops, 318 

 Rubber-plant, 64, 66 

 Rubiaceae, 463 

 Rubus australis, 28 

 Rudbeckia, 533 

 Rue anemone, 463 

 Ruflners, 164, 350 

 RydJIcultivated, 293 



wild, 293 



Saccharomyces, 98 

 Sage, 479 

 Sagittaria, 449 

 Sago palm, 390 

 Salix, 12, 346, 457, 458 



babylonica, 457 



discolor, 457 

 Salvia, 480 

 Salvinia, 341 

 SaUcaceae, 457 

 Saltation, orthogenetic, 528 

 Sanitary theory, 92 

 Sanitation, 311 

 Sap, nuclear, 184 

 Sapium sebiferum, 84 

 Saprophytes, fungus, 322 

 Saprophytism, 321, 322 

 Saururaceae, 459 

 Saururus cernuus, 32, 459, 460 

 Saussure, Nicolas Theodore de, 74 

 Savory, 479 

 Schleiden, 15 

 Schwann, 15, 94 

 Science, essence of, 620 

 Scion, 335 

 Scott, D. H., 619 

 Scrophulariaceas, 481 

 Scutellum, 494 

 Secale cereale, 293 

 Secretions, 19 

 Sedum, 31 



Seed, essentials of, 453 

 Seed-coat, 397, 453 

 Segregation, law of, 555 



Mendelian, 554, 556 

 Selaginella, 382, 384, 431 



amcena, 383 



Kraussiana, 387 



life-cycle of, 388 



Martensii, 385 



