148 



INDEX. 



Phosphoric anhydride, quantity 

 removed from soil by caue crop, 

 50 



Phosphorus, 2 ; removal of, from 

 iron, 70 



Pigeon-pea, peculiarities of forma- 

 tion, 28 ; value as green dressing, 

 65 



Pigs, nitrogen and ash constituents 

 obtained from and voided by, 

 57,58 



Pipe drains, 36-38 



Plant-food, 6 et seq. ; proportions 

 in soil, 21 et seq. ; consumption 

 by various crops, 22 ; amount 

 soluble in dilute acid, 23 ; avail- 

 able and slowly available, 24; 

 exhaustion of, 25 ; how produced 

 by microbes, 26 ; constituents 

 soluble in water, 30 ; produced 

 from trash, 53 ; in mould from 

 watercourses, 54 



Planting, 40, 42^7,51, 52 



Plants, respiration of, 12 ; transpi- 

 ration of, 13 ; influence of light 

 on, 13 ; death of, 15 



Plant-tops, 43-45 



Ploughing, 18, 39, 40, 52, 53 



Polariscope, use of the, 99 



Polariscopic test, dependence on 

 proper draining, 101 



Potash, 17, 21-25, 48; insolu- 

 ble in water, 30 ; retention by 

 soil, 30; deficiency of, 33 ; when 

 to apply, 47 ; quantity removed 

 from soil by cane crop, 50 ; fused 

 vpith silica in burning trash, 5o ; 

 not created by burning trash, 53 ; 

 in mould from watercours?, 54 ; 

 in pen manure, 50, 04 ; material 

 in animal growth, 57 ; loss of, 

 in rotting manure, 61 ; dressing 

 with, to follow green crops, 65 ; 

 importance of keeping up supply 



of, 60 ; its sources and use, 66, 

 67 ; sulphate preferable to chlor- 

 ide, 68 ; constituent of guano, 70 ; 

 amount in filter-press cake, 93 ; 

 constituent of dunder, 135; re- 

 covery of, from beet-sugar, 125 ; 

 amount in beet molasses, 126; 

 amount in cane molasses, 126 



Potassium, 2, 3 



Potassium nitrate, 26 



Potatoes, consumption of plant- 

 food by, 22 



Prairie soil, 24 



Precipitated phosphate, 69 



Proof spirit, origin of the term, 

 133, 134 



Proof-stick, the, 106 



Protoplasm, 6 



Putrefaction, causes of, 127 



Rain, influence on soil, 18 



Ratoons, 42, 44, 45, 51, 52 



Reaping, 51 



Rectified spirit, when to make, 133 



Rectif^dng-column, 134, 185 



Redistillation, 134 



Rocks, classes of, 16 



Root, of sugar-cane, 6-10 ; powers 

 of assimilation of minerals, 21, 22 



Root-cap, the, 7, 8 



Root-growth, 35, 36 



Root-hairs, 7-10, 32 



Rootlets, growth of, 47 



Root-nodules, 28, 29 



Roots, growth of, 8 



Root-tips, in clay soils, 32 



Roth, Henry Ling, observations 

 of, 7 



Rothamsted, experiments con- 

 ducted at, 57, 58 



Rule of thumb, displaced by mod- 

 ern agriculture, vi 



Rum, manufacture, 91 ; flavor and 

 aroma, 132 ; strength of com- 



