xviii 



variation of composition of dung ; N in urine, its proportion and the forms 

 in which it occurs ; composition of dung and urine of different animals ; litter ; 

 urine-earth ; box-manure ; value of Indian cowdung and urine about the 

 same as of English cowdung and urine; amounts of plant food in i ton of 

 farmyard manure ; practical value of cowdung as determined by experiments ; 

 poudrette ; town-sweepings ; silt : vegetable refuse ; ammonia ; nitric acid ; 

 conditions affecting loss of N; albuminoids ; green-manuring ; aquatic weeds ; 

 straw ; saw-dust ; leaves ; seeds ; oil-cakes ; megass ; refuse of sugar refineries, 

 silk, indigo and glue factories, particularly rich ; coal ; soot; blood ; flesh ; 

 skin; horn 5 hair 5 feather; carcasses of animals; refuse of fish; guanos; 

 utilization of sewage ; " Native guano" ; deodorising processes ; practical 

 value of sewage and sewage-grass ; crops suitable for sewage irrigation ; 



animal refuse of more value than vegetable refuse. pp. 516 to 542. 



Chapter LXXXIX. Phosphatic manures. Apatite ; other phosphatic 

 minerals ; phosphatic clay of Nepaul valley; Trichinopoly nodules; coprolites ; 

 bones ; boiled bones ; animal charcoal ; slag ; tests for phosphates ; available 

 phosphates; grinding of bones without mill ; super, its manufacture ; composi- 

 tion >f supers ; how valued ; why manufacture of super of no great importance 

 for India ; estimation of monocalcium and dicalcium phosphates ; Dr. Dyer's 

 method, pp. 542 to 553. 



. Chapter XC. Potash manures. Felspars, chiefly orthoclase, and 

 mica ; zoolites ; admixture of lime to felspar ; other potassic minerals ; test 

 for potash ; kainit ; ashes ; sugar-refuse ; adaptability of potash manures to 

 root-crops and pulses; silt; irrigation-water; saltpetre; urine, specially 

 of poorly fed cattle ; ashes should be sprinkled over compost ; reclamation 

 of saline soils ; potash in different parts of plants ; physiological actions of 

 potash ; Dr. Dyer's method of estimation of available potash ; available 

 nitrogen. Percentage composition of principal manures ; manurial substances 



removed by different crops. pp. 554 to 561. 



'Chapter XCI. Calcareous manures. Mineral sources ; occurrence 

 in India ; effects of this manure ; dangers of using it ; application ; marling ; 

 silicate of calcium ; calcium in farmyard manure ; solubility greater in water 

 charged with CO 2 gas; unslaked lime; Magnesia and soda 5 occurrence of 



N, P 2 O 5 , K 2 O, CaO, MgO and Na.,O in irrigation- waters pp. 553 to 569. 



Chapter XCII. Gypsum and salt. Occurrence of gypsum; effect of 

 gypsum on usar soil ; other effects of gypsum ; application ; crops particularly 

 benefited ; sources of salt ; crops particularly benefited ? disintegrating effect 

 of lime and salt ; objections to salt as manure; germicidal effect on wheat- 

 rust &c. ; Mechanical action ; application unnecessary within 150 miles of the 



sea-coast; caution against free use of lime and salt pp. 56910575. 



Chapter XCIII. Jadoo-fibre. How manufactured ; its effects ; renova- 

 tion ; conditions of application, pp. 576 and 577. 



