GENERAL INDEX 



Absorption capacity of soils for zinc 41 



of poisons by plants 25 

 Accelerators 45 

 Action of heavy metals in mixed solutions 



20 



Adsorption 8, 23 

 Aeration in water cultures 8 

 Algae, assimilation of arsenic by 62 



clearing ponds of 35 



effect of arsenic on 62 



effect of boron on 76 



effect of copper on 35 

 Aluminium 45, 78 

 Arbutin 4 

 Arsenate, potassium 53, 62, 63 



sodium 55, 57, 61 

 Arsenates 53, 57 

 Arsenic acid 53, 54, 60, 61, 62, 64 



acid v. arsenious acid 53 



acid v. phosphoric acid 53, 62 



elimination of 59 



gas liberated by moulds 63 



in soil, effect of 58 



in superphosphate 58 

 Arsenious acid 53, 54, 57-61, 64 



immunity of plants to 58 

 Arsenite, sodium 55, 56, 61 

 Arsenites 53, 57 



v. arsenates 57 

 Artificial oxydases 84 



soil 24, 46 

 Assimilation, reduction in water plants 48 



Barium 44 

 Borate, calcium 71 



potassium 71 

 Borates 72 

 Borax 71, 73 

 Bordeaux mixture 30 



blocking of stomata by 33 



on assimilation, effect of 33 

 Boric acid 1, 65-76, 93 

 Boromannitic acid 68 

 Boron, antiseptic action of 70 



colour due to 75 



distribution in plants 66 



poisoning, indication of 68, 69 



role in plant economy 74 



Cadmium 31 

 Calamine 37 



plants 38 



soils, flora of 37 



Calcium carbonate 4, 23, 25 



chloride 20, 59 



sulphate 20, 44, 45 

 Carbon black 23 



dust 10 



Catalytic elements 49, 91 

 Chlorophyll 44, 60 

 Complementary manures 47, 91 

 Conditions of plant life 7 

 Copper, acetate 19 



action on plant organs 30 



bi-carbonate 26 



bromide 19 



chloride 19, 20 



compounds, corrosive action on plant 

 roots 5, 27 



distribution in tissues 16 



mode of action on plants 25 



nitrate 19, 25 



oxide 15, 25 



quantity in certain plants 17 



salts, injection into plant tissue 31 



sprays, effect on leaves 30, 32 



sulphate 5, 19, 20, 22-27, 29-35, 41 

 Cumarin 4 



Distilled water, preparation of 10 

 Double decomposition in soil 25 

 Duration of experiments 13 



Experimental methods, comparison of 14 



Ferric chloride, sublimed 86 



hydrate 23 

 Fungi, effect of arsenic on 63 



effect of boron on 76 



effect of copper on 33, 34 



effect of manganese on 90 



effect of zinc on 48 



Galactose 76 



Glucose 76 



Germination, effect of arsenic on 60 



effect of boron on 72 



effect of copper on 27, 28 



effect of manganese on 84 



effect of zinc on 43 



of seeds in sawdust 11 

 Grading of seeds 11 

 Growth in copper-distilled water 17 



of peas in water cultures 11 



Hydrochloric acid 22 



