Paristyphnin, 78 Parsnip, Water, 37, 101 — Wild, 93 Pasque Flower, 9 _Pastinaca sativa_, 93 Peas, Indian, 27, 96 — Mutter, 27 _Pedicularis_ sp., 63, 95 — _palustris_, 63 — _sylvatica_, 63 Penny Cress, 101 Penny-Wort, Marsh, 93 Persicaria, 64 Petty Spurge, 66, 105 Phaseolunatin, 8, 33 _Phaseolus lunatus_, 4, 32, 104 _Picea_ sp., 72 Picein, 72 Picrotoxin, 36, 83 Pimpernel, Scarlet, 48 _Pinguicula vulgaris_, 101 Pinipicrin, 72 _Pinus larix_, 104 — _pinaster_, 104 — _strobus_, 72 — _sylvestris_, 72 _Pisum sativum_, 27 Poison Weed, 48 Polygonaceæ, 63 _Polygonum Aviculare_, 102 — _Convolvulus_, 102 — _Fagopyrum_, 64 — _hydropiper_, 64, 65 — _Persicaria_, 64, 65 Poppies, 8, 16, 103, 105 Potato, 54–58 _Potentilla Anserina_, 92 — _tormentilla_, 88, 93 Primulaceæ, 48 Privet, 4, 49, 105 Protopine, 17 Prulaurasin, 34 _Prunus laurocerasus_, 34, 104 Pseudoconhydrine, 41 _Pteris aquilina_, 87, 93 Pteritannic acid, 88 Pulsatilla-camphor, 9 Purging Flax 92, 104 _Quercus_ sp., 69–72, 100 Radish, Wild, 18 Ragwort, 44 Rangoon beans, 32 Ranunculaceæ, 9 _Ranunculus_ sp., 8, 9, 10, 12, 99 — _acer_, 11 — _acris_, 10, 11, 105 — _aquatilis_, 10, 105 — _auricomus_, 105 — _bulbosus_, 10, 11, 105 — _Ficaria_, 10, 11, 105 — _Flammula_, 10, 11, 105 — _lingua_, 10 — _repens_, 10, 12, 99 — _sceleratus_, 10, 11, 99, 105 _Raphanus Raphanistrum_, 18 Rhamnaceæ, 24 Rhamnetin, 24 _Rhamnus Catharticus_, 24, 105 — _Frangula_, 24 Rheadine, 16 Rhinanthin, 63, 96 _Rhinanthus_ sp., 63 — _Crista-galli_, 95 Rhododendrin, 47 _Rhododendron_ sp., 4, 46, 100 — _arboreum_, 47 — _californicum_, 46 — _Chrysanthum_, 46 — _cinnabarinum_, 47 — _ferrugineum_, 46 — _hirsutum_, 47 — _maximum_, 46 — _ponticum_, 46, 47 — _punctatum_, 47 Ricin, 34 Ricinine, 34 _Ricinus communis_, 33 _Roemeria hybrida_, 105 Rosaceæ, 34 _Rumex Acetosa_, 63, 104 — _Acetosella_, 63 — _crispus_, 64 _Ruta graveolens_, 104 St John’s Wort, 22 _Sambuca Ebulus_, 43, 104 — _nigra_, 43, 104 Sambucine, 44 Sambunigrin, 44 _Saponaria officinalis_, 19, 105 Saponins, 8, 9, 19, 21, 77, 78, 97 Sapotoxin, 21 _Scabiosa succisa_, 93 93 Scarlet Pimpernel, 48 _Scilla bifolia_, 105 Scopolamine, 50, 51, 59 _Scrophularia aquatica_, 95 — _nodosa_, 95 Scrophularine, 95 Scrophularineæ, 61 _Sedum acre_, 93, 105 —_album_, 105 _Senebiera didyma_, 101 Senecifolidine, 45 Senecifoline, 45 _Senecio Burchellii_, 45 —_Jacobœa_, 44 —_latifolius_, 45 Sheep’s Sorrel, 63 Shepherd’s Purse, 101 Silica, 86 Silver Weed, 92 Sinalbin, 18 Sinapine, 18 _Sinapis alba_, 105 —_arvensis_, see _Brassica sinapistrum_ —_nigra_, 105 _Sium angustifolium_, 37, 101, 104 —_latifolium_, 37, 101 Sium, Lesser, 101 Smilacin, 21 Snake’s Head, 97 Soapwort, 19, 105