, 40.
Phlein, =62=.
Phloretin, 79.
Phloridzin, =79=.
Phloroglucinol, 95.
Phosphates, 7.
Phosphatides, 141, =143=.
Phosphoproteins, 175.
Phosphorus, 3, 5, =7=.
Photo-chemical action of light, 253, 257.
Photolysis, 26.
Photosynthesis, 7, 8, 18, 21, 22, =24=, 254.
Phycoerythrin, 102, =115=.
Phycophaein, 102, =115=.
Phyllins, 106, 107.
Phyllophyllin, 107.
Phyllopyrrole, 109.
Physiological adaptations, 252, =257=.
Physiological use, =19=.
Phytase, 189.
Phytochlorin, 108.
Phytorhodin, 108.
Pigment glucosides, =82=.
Pigments, 18, =102=, 224, 254.
Pinene, 147.
Piperidine, 154.
Piperine, =155=.
Plant amines, =151=, 152, 163.
Plant food, =1=.
Plant nucleic acids, =162=.
Polybasic acids, 124.
Polyhydric alcohols, 31.
Polypeptides, 167.
Polysaccharides, =59=.
Polyterpenes, 147.
Poppy wax, 140.
Populin, =80=.
Porphyrins, 108.
Potassium, 3, 5, 8, 10, 13, 14.
Primary amines, 152.
Proenzymes, 198.
Proinulase, 199.
Proinvertase, 199.
Prolamins, 175, 176.
Proline, 169, 177.
Prolipase, 199.
Prooxidase, 199.
Protamines, 175, 176.
Proteans, 175.
Proteases, 186, 189, =192=.
Protective colloids, 209.
Proteins, 7, 18, 20, 151, 162, 163, =164=, 224.
Proteoses, 175.
Protoplasm, 17, 26, 221.
Prulaurasin, 87.
Prunase, 87.
Prunasin, 87.
Ptomaines, 152.
Purine, =159=.
Purine bases, 151, =159=, 162.
Purpurin, 83.
Putrescine, 152.
Pyrimidine, 161.
Pyrimidine bases, =161=, 162.
Pyrocatechol, 95.
Pyrogallol, 95.
Pyrogallol tannins, =97=.
Pyroxylin, 73.
Pyrrophyllin, 107.
Pyrridine, 154.
Pyrrolidine, 154.

Quaternary amines, =152=.
Quercetin, 84, 118.
Quercitrin, =84=.
Quinine, 155, =157=.
Quinoline, 155, 158.

Radiant energy, 19.
Raffinose, 45, 52, =53=.
Rape-seed oil, 130.
Reducing sugars, 39, 49.
Reductases, 186, 190.
Reserve food, 21.
Resenes, 149.
Resins, 18, 146, =149=.
Resorcinol, 95.
Respiration, 18, 121, 235, 236.
Rhamnase, =77=, 189.
Rhamnetin, 84.
Rhamnose, 35, 52, 77, 79.
Rhodeose, 35, 81.
Rhodophyllin, 107.
Ribose, 35.
Ricin, 176.
Rubiadin, 83.
Rubiphyllin, 107.

Saccharide, =31=.
Salicin, =80=.
Saligenin, 80.
Salinigrin, =81=.
Salts, 224, =227=, 237.
Sambunigrin, 87.
Sapogenins, 90.
Saponification, 134.
Saponification value, 138.
Saponins, =90=.
Sapotoxins, 90.