516 



INDEX 



Rubber, 149, 359 



assam, 366 



balata, 363 



Brazilian, 360 



caucho, 363 



ceara, 363 



desert milkweed, 368 



guayule, 368 



India, 366 



intisy, 365 



Lagos, 365 



Landolfia, 365 



Panama, 363 



Para, 360-362 



synthetic, 369 

 Rue Family, 104, 201 

 Rum, 243 



Rusts, 341, 429-431 

 Rye, 144, 178, 179 



Sage, 232 



Sagebrush, 464 



Sago palm, 101, 397 



Sake, 243 



Sand corn, 468 



Sandalwood, 389 



Saprophyte, 45 



Sapwood, 41 



Sargasso Sea, 90 



Saxifragaceae^ 442 



Saxifrage, 443 



Saxifrage Family, 104, 442, 443 



Sawdust, 328 



Scarlet bugler, 457 



Schizophyta, 86, 87, 107 



Sclerenchyma, 250, 251 



Scotch broom, 480 



Scouring rush, 98 



Scrophulariaceae, 456 



Seaweed, 10, 28, 54, 108 



Seed, 60, 66, 67, 75, 76 



plants, 100 

 Selaginella, 61 

 Selection, 150, 151 

 Sepal, 69, 71 

 Sequoia, 18, 19, 269, 270 

 Sex organ, 54, 55 

 Sexual reproduction, 20, 53 

 Shavings, 328 

 Shepherd's purse, 440 

 Shingles, 315 

 Sieve tube, 8 

 Silverrod, 461 

 Sisal, 255, 352, 353 

 Skullcap, 455, 456 

 Skunk cabbage, 463, 464 

 Smuts, 427, 428, 429 

 Snow plant, 454 

 Soap plant, 468 

 Softwood distillation, 323 

 Solomon's seal, 466 

 Soluble starch, 397 

 Sorghum syrup, 222 

 Soy bean, 146, 180, 181 

 Spanish bayonet, 469 



dagger, 469 

 Spathe, 72 

 Spearmint, 232 

 Species, 83 

 Speedwell, 457 

 Sperm, 54 



Spermatophyta, 86, 99, 100, 108 

 Sphagnum, 120, 121 

 Spices, 224-225 

 Spinach, 145, 163 

 Spirilla, 404, 409, 410. 

 Spirogyra, 27, 52, 88 

 Sporangium, 52, 58, 62, 65, 66 

 Spore, 20, 51, 58 

 Sporophyte, 57, 59 



