110 



General Index 



Hydroquinone 91 



Hypothesis of universal stimulation 93 



Iodine 2, 91 



Individuality of plants, error due to 13 



of species 61 



Interaction between soil and poison 9 

 Iron 31, 49 



oxide 78 



sesquioxide 84 



sulphate 48, 81, 85, 88 



Laccase 91, 95 



Lack of control over field experiments 9 



Lead 10, 26, 42, 44 



Magnesium carbonate 83, 84, 87 



chloride 20 



sulphate 1 

 Manganese as top-dressing 89 



chloride 86, 88 



commercial value of 88 



cytological action of 81, 82 



dioxide 84, 87 



essential to Coniferae 80 



in Australian soils 83 



in leaves, deposition of 82 



in organic combination 79 



iodide 83, 84 



manuring, after-effects of 88 



nitrate 83, 84 



oxide 78, 79, 83, 84, 86, 88 



phosphate 79, 83, 86 



retardation of ripening by 82, 85 



sulphate 81-89, 94 



Masking effect of inorganic food salts 4, 20 

 Mercuric chloride 22 



oxide 41 

 Mercury 26 

 Metallic oxides 78 

 Methods; field experiments 9 



sand cultures 8 



soil cultures in pots 9 



water cultures 7, 11 

 Mode of entry of poisons into plants 4 



Nickel 24, 50 



Nucleinic combination 79 



Nutrient solutions, composition 13 



Oligodynamic action 28 

 Over-mineralisation of plants 71 



Phosphoric acid 53, 54, 62, 64 

 Photosynthesis, effect of copper on 32 

 Potassium hydrate 22 

 Presence of arsenic in animals 51 

 in plants 51 



of boron in plants 65 



of copper in plants 15 



of manganese in plants 78 



of zinc in plants 36 

 Pyrogallol 91 



Eaulin's solution 49 



Reproduction of poisoned plants 40 



Silver nitrate 22 

 Sodium chloride 20, 44 



hydroxide 22 



nitrate 4 



Sterile cultures 24 



Stimulation, by injection of copper solu- 

 tions 31 



by small doses of poisons 2 



definition of 2 



local 47 



of Aspergillus niger 50 



of fungi by copper 34 



of plants by arsenic 61 



of plants by boron 73 



of plants by copper (negative) 28 



of plants by manganese 84 



of plants by zinc 45-47 



physiological considerations of man- 

 ganese 90 



Strontium sulphate 5 

 Sugar 22, 31, 48, 49, 50, 68 

 Sulphur, flowers of 10 



Thymol 22 



Toxic action, effect of arsenic 52 

 effect of boron 67 

 effect of copper 17 

 effect of light on 44 

 , effect of manganese 81 



effect of zinc 38 

 equivalent 18 



limits of plant poisons, estimation of 26 

 Toxicity, of nutrient salts 1 

 of organic compounds 4 

 of poisons, cause of 22 

 of positive ions in copper compounds 



19, 22 



reduction of 39, 44 

 reduction of, by carbon black and ferric 



hydrate 23 



reduction of, by insoluble substances 22 

 Toxin and nutrient, distinction between 3 

 Transmission of power of resistance 72 



Valency, effect on toxicity 44 

 Vanillin 4 



Variation in results on different substrata 

 24 



Zinc, absorption by roots 42 

 carbonate 38, 42, 43 

 effect of, on lower plants 48 

 effect of, on plant and soil 41 

 fixation of 49 



mode of action on plants 43 

 oxide 37, 47 



oxide on leaves, deposition of 47 

 storage in seeds 43 

 sulphate 38-49 

 sulphide 42 



CAMBRIDGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS. 



