INDEX. 



147 



soil by a crop, 22 ; how absorbed 

 by plants, 20, 38, 29 ; chemical 

 changes in, to render available 

 as manure, 26 ; deficiency of, 33 ; 

 quantity removed from soil by 

 cane crop, 50 ; amount in mould 

 from watercourse, 54; presence 

 in pen manure, 56; material in 

 animal growth, 57 ; quantity ob- 

 tained from and voided by cattle, 

 57; Muntz-Girard experiments 

 on, 58, 59 ; loss in rotting ma- 

 nure, 61 ; loss from overheating 

 manure, 62 ; amount in pen ma- 

 nure, 64 ; supplied by leguminous 

 crops, 65 ; supplied by seaweed, 

 66 ; constituent of bones, 68 ; 

 constituent of guano, 70; pro- 

 portions in nitrate of soda and 

 sulphate of ammonia, 73 ; amount 

 in filter-press cake, 93, 96 

 Nitrogenous manures, their compo- 

 sition and use, 31, 71, 72 



OATS, consumption of plant-food 

 by, 22 ; value of manure pro- 

 duced from their consumption 

 by cattle, 64 



Oil-cake, use as food and as ma- 

 nure, 71 



Open-fire evaporation, 100 



Open-trench draining, 34 



Organic acids, use in tempering. 99 



Osmose, 9, 10, 82 



Oxen, nitrogen and ash constitu- 

 ents obtained from and voided 

 by, 57, 58 



Oxide of alumina, 30 



Oxide of iron, 21, 23, 30 ; amount 

 in mould from watercourse, 54 ; 

 amount in pen manure, 64 ; 

 amount in filter-press cake, 93 



Oxide of manganese, amount in 

 mould from watercourse, 54 



Oxygen, 2, 3, 5, 6, 11, 12, 36 ; nec- 

 essity of, for some fermenta- 

 tions, 129, 130 



PARASITES, destruction by burning 

 trash, 53 



Pea-plant, its mode of feeding, 28 



Peas, value of manure produced 

 from their consumption by cat- 

 tle, 63 ; value as green dressing, 

 65 



Pen manure, its use, constituents, 

 etc., 25, 26, 41, 56-64, 66 



Permanent water-level, 35 



Perspiration, quantity of ash con- 

 stituents voided by cattle in, 58 



Phaseolus mungo, value as green 

 dressing, 65 



Phenol-phthalein, use of, 87-90, 

 113, 130 



Phosphate of lime, 16; effect of 

 plant-roots on, .22 ; constituent 

 of bones, 68 ; where found, 69 ; 

 amount in filter-press cake, 93, 

 94, 96; in decolourisation pro- 

 cess, 115 



Phosphates, 21, 70 ; insoluble in 

 water, 30 ; when to apply, 47 ; 

 injured in burning of trash, 53 ; 

 material in animal growth, 57 ; 

 dressing with, to follow green 

 crops, 65 ; importance of keeping 

 up supply of, 66 



Phosphatic manures, their compo- 

 sition, and use, 68-71 



Phosphoric acid, 17, 21-25 ; reten- 

 tion by soil, 30; deficiency of, 

 33; amount of, in mould from 

 watercourse, 54 ; in pen manure, 

 56, 64 ; constituent of basic phos- 

 phate of lime, 70, 71 ; precipita- 

 tion in under-tempering, 94 ; de- 

 colourisation by, 114, 115 ; con- 

 stituent of dunder, 135 



