Saprophytes, 16.
"Saturated" acids, 132.
Scopolin, =82=.
Secalin, =63=.
Secondary amines, 152.
Secretions, 20.
Sedoheptose, =36=.
Semipermeable membranes, =228=.
Sensitizers, 27.
Serine, 168.
Silicates, 12.
Silicon, 4, =12=.
Silver, 247.
Simple proteins, 165, 174, =175=.
Sinalbin, 89.
Sinalbin mustard oil, 89.
Sinapin acid sulfate, 89.
Sinigrin, =88=.
Sinistrin, =62=.
Sitosterol, 136.
Skimmetin, =81=, 82.
Skimmin, =81=.
Soaps, 134, 208.
Sodium, 4, 9, =12=, 13, 14.
Sodium stearate, 133.
Sol, 205.
"Soluble starch," 60.
Sorbitol, 48.
Sorbose, 36, 38, 45, =48=.
Specific rotatory power, =38=, 39.
, of fructose, 39, 47.
, of galactose, 49.
, of glucose, 39, 47.
, of maltose, 51.
, of raffinose, 53.
, of sucrose, 39.
Spermaceti, 129, 133.
Stachydrine, 155.
Stachyose, 54.
Starch, 8, 22, 28, 30, 31, 45, =59=, 64.
"Starch paste," 60.
Stearin, 131, 134.
Stereo-isomerism, =32=.
Stigmasterol, 136.
Structural adaptations, =255=.
Structural isomerism, =32=.
Strychnine, 155, =157=.
Substrate, 186.
Sucrase (_see_ invertase).
Sucrose, 28, =49=, 64.
Sugars, 8, 18, 22, 28, 30, 31.
Sulfur, 3, 5, =11=, 148.
Sulfuretted oils, 147, =148=.
Sulfur test, 174.
Sunflower-seed oil, 130.
Surface boundary phenomena, =231=.
Surface energy, 231.
Surface tension, 231.
"Survival of the fittest," 254.
Suspensoids, 206, 214.
Suspensions, 206.
Synergic foods, 2, 20.
Synthesis, 18.

Tagatose, 36, 38, 57.
Talose, 36, 38, 42, 57.
Tannins, 18, =94=, 97, 99, 100, 127, 208, 224.
Tannon group, 96.
Terpenes, =147=.
Tertiary amines, 152.
Tetrapeptids, 167.
Tetrasaccharides, =54=.
Tetrose, 30, 35.
Theobromine, =160=.
Theophylline, =160=.
Thioglucose, 88.
Threose, 35.
Thymine, 161, 162.
Thymol, 148.
Toxins, 13, 239, 240, =245=.
Translocation diastase, 191.
Trehalase, 51.
Trehalose, 49, =50=.
Triglycerides, 131.
Trimethyl amine, =152=.
Trimethyl glycocoll, 143.
Triose, 30, 35.
Trioxymethylene, 22, 23.
Tripeptids, 167.
Trisaccharides, 31, =52=.
Triticin, 59, =62=.
Tryptophane, 169, 171, 177.
Tuberin, 176.
Turanose, =49=, =53=.
Tyndall phenomena, 212.
Tyrosine, 115, 168, 177.

Unavailable plant food, 4.
Ultrafilter, 215.
Ultramicroscope, 203, 204, 205, =211=.