22 On Liquid Manure. 



Soluble silica (soluble in caustic potash) .. .. 6-75 



Insoluble silicious matter (fine clay) .. .. 15*84 



Oxides of iron arid alumina 2 '46 



Lime 6 '90 



Magnesia '81 



Potash 36 



Chloride of potassium 2*03 



Chloride of sodium 5 02 



Phosphoric acid 3 88 



Sulphuric acid 2*02 



Carbonic acid and loss 52 



According to these analytical results, an imperial gallon of the 



muddy liquid manure from Tiptree Hall contained : 



* Water and ammonia driven out on boiling .. .. 69,904*24 



t Organic matters 50*19 



Mineral matters 45*57 



Consisting of 



Soluble silica 6*47 



Insoluble silicious matter (clay) 15*17 



Oxides of iron and alumina 2*36 



Lime 6*60 



Magnesia 1*73 



Potash -35 



Chloride of potassium 1*95 



Chloride of sodium 4*81 



Phosphoric acid .. .. 3*72 



Sulphuric acid 1.94 



Carbonic acid and loss *47 



70,000*00 



* Containing ammonia 2-846 



f Containing nitrogen 2*17 



Equal to ammonia 2.63 



Total quantity of nitrogen per gallon .. .. 4*51 



Equal to ammonia 5*476 



It will be seen that the proportion of organic matter, as well 

 as that of mineral matters, in the muddy liquid is much larger 

 than in the clear liquid. But even this additional quantity of 

 fertilising substances does not materially increase its value, for 

 the additional amount of organic matters furnishes only 1*65 

 grains of nitrogen beyond the nitrogen contained in the organic 

 substances of the clear liquid ; and the additional mineral 

 matters chiefly consist of fine clay, which of course adds nothing 

 to the fertilising value of this manure. 



Since the intrinsic value of all manuring substances is mainly 

 dependent upon the amount of nitrogen, phosphoric acid, and 

 potash which they contain, some idea of the relative merits of 

 these six kinds of liquid manure may be formed by comparing 

 the proportions of these constituents which each kind contains. 

 I have, therefore, grouped together these determinations of 

 nitrogen, potash, and phosphoric acid, as well as some other 

 data which will facilitate comparison. 



