110 EXPERIMENTAL PLANT PHYSIOLOGY 



Health value of plants, 68, 78 

 Heat, a factor in germination, 8! 

 Heliotropism, 92 

 Hydrochloric acid, 11, 58 

 Hydrolysis, 61 

 Hydrotropism, 95 



Imbibition, 83 



Injury, provision against, 101 



Intramolecular respiration, 75 



Iodine, 46 



Iron filings, 36 



Kinetic energy, 79, 84 

 Klinostat, 98 



Leaf fall, 31 



Leaves, influence on ascent of 

 water, 21 



— starch formation in, 48-56 

 Life, a factor in germination, 88 

 Light, action on direction of 



growth, 91, 92, 98 



— a factor in germination, 87 

 Lime-water, 54 



— action of air on, 39 



— action of breathing on, 40 



— action of combustion on, 40 

 Litmus, 11 



Manganese dioxide, 37 

 Marble, 10 

 Medullary ray, 20 

 Micropyle, 82, 83 

 Moisture, action on direction of 

 growth, 94 

 — a factor in germination, 82 



Negative heliotropism, 92 

 Negative hydrotropism, 95 

 Nitrogen, 37 

 — properties of, 35 



Osmosis, 15, 16 

 Oxygen, 37 



— absorption of, 72 



— evolution of, 57 



Oxygen, necessity of, to plant life, 

 76 



— preparation and properties of, 



38 

 Phosphorus, 34 

 Pig's bladder, 14 

 Pith, 20 

 Plumule, 82 



Positive heliotropism, 92 

 Positive hydrotropism, 95 

 Potash, 54, 58 

 Potassium bichromate, 51 



— chlorate, 37 

 Potato, 15 



Potential energy, 79, 84 

 Pyrogallic acid, 77 



Kadiclb, 82 

 Reducing sugar, 59 

 Kespiration, 70 



— absorption of oxygen, 72 



— action on temperature, 77 



— amount of oxygen absorbed, 



73 



— amount of carbon-dioxide 



evolved, 74, 76 



— evolution of carbon-dioxide, 



71 



— intramolecular, 75 



— significance of, 78 

 Root, absorption by, 3 



— absorption of soluble sub- 



stances, 10 



— growing part, 103 



— hairs, 17 



— pressure, 22 



— rate of absorption by, 4 



— sensitiveness to gravity, 100 



Salts, soluble, 2 



Shoot, growing part, 105 



Soda-lime, 54 



Soil, absorption of food from, 2 



— composition of, 1 



Starch, action of mineral acid on, 

 61 



— composition of, 53 



— conversion to sugar, 57, 60 



— formation, action of air, 53 



— — action of carbon-dioxide, 



55 



