INDEX. 



249 



Potash (caustic), 4, 5, 59, 67. 75, 97, 106, 



111, 151, 176, 179, 180. 

 Potassium, 2. 

 Potato, 215. 



Potato-fungus. See " Phytophthora." 

 Potentilla. See " Cinque-foil." 

 Potomogeton. See " Pond-weed." 

 Prickly-ash, 198. 



Prickly fungus. See " Hydnum." 

 Prickly -pear, 204. 

 Prickly-poppy. See " Aryemone." 

 Primrose, 211. 



Primula, -acese. See " Primrose." 

 Prince's-pine, 210; Fig. 116. 

 Procarp, 51. 

 Proteacese, 205. 

 Prothallium, 102, 103, 114, 122, 125, 133, 



144, 177. 



Protococcus, -acese, 22, 74; Fig. 11. 

 Protophyte, 11. 

 Protoplasm, 7. 



movements of, 7. 

 Pteridophyte, 102, 153. 

 Puccinia, 81 ; Fig. 47. See also 



" Wheat-rust." 

 Puccoon, 215. 



Puff-ball. See " Lycoperdon." 

 Purslane, 185. 



Putty-root. See "Aplectrum." 

 Pyrenoid, 25, 31. 

 Pyrenomycetes, 76. 

 Pyrola, -acese, 210. 



Quince, 170. 



Quill-wort, 125, 126 ; Fig. 74. 



Raceme, 174. 



Radial fibro-vascular bundles, 138, 

 176. 



Radish, 192. 



Ranunculus, -acese. See "Butter- 

 cup." 



Raspberry, 207. 



Ray-flower, 223. 



Receptacle, 167, 207, 223. 



Receptive spot, 106. 



Red alga, 21, 49, 52, 53; Figs. 29-31. 



Red-bud, 209; Fig. 115. 



Red cedar, 79, 131, 141 ; Fig. 78. 



Red-wood, 142. 



Reference-books, 235-236. 



Reseda, -acese. See " Mignonette." 



Resin, 130. 



Resin-duct, 130, 135, 137. 



Resting-spore, 28, 32, 37, 57. 



Rheumatism-root. See " Twin-leaf." 



Rhexia, 206. 



RJdzocarpese. See " Water-fern." 



Rhizoid. See " Root-hair." 



Rhizome. See " Root-stock." 



Rhododendron, 210 ; Fig. 116. 



Rhodophycese. See " Red algae." 



Rhodoracese, 211. 



Rh<j>adinse, 190. 



Rhus. See " Sumach." 



cotinus. See " Smoke-tree." 

 toxiocodendron. See" Poison-ivy." 

 venenatct. See ' ' Poison-dogwood.' ' 



Ribes, -iese, 203; Fig. 111. 



Ricciacese, 91 ; Fig. 57. 



Richardia. See "Calla." 



Ricinus. See " Castor-bean." 



Ringless-fern, 116. 



Rock-rose, 195. 



Rock-weed. See " Fucus." 



Root, 102, 104, 114, 173. 



Root-cap, 115, 175. 



Root-hair, 38, 87, 91, 96, 104, 135. 



Root-stock, 154, 172. 



Rosa, -acese. See " Rose." 



Rose, 181, 206 ; Fig. 114. 



Rosiflorse, 206. 



Rubiacese, 223. 



Rush, 154, 225 ; Fig. 83. 



Rust, white. See " Cystopus." 

 red. See " Urediness." 

 black. See " Urediness." 



Sabal. See " Palmetto." 

 Sabbatia. See " Centaury." 



