3.98 10.55
Lime 4.63 5.71 18.15 2.63
Magnesia 3.84 11.47 5.45 2.24
Phosphoric Acid 8.93 4.75 7.52 0.41
Sulphuric acid 1.83 1.77 2.69 0.90
Carbonic acid ... trace trace 0.60
Oxide of manganese 2.13 ... ... ...
Sand ... ... ... 61.37
---- ---- ---- ----
99.80 99.29 99.64 99.82

Human faeces contain about 75 per cent of water; and their dry residue
was found by Way to have the following composition:--

Organic matter 88.52
Insoluble siliceous matters 1.48
Oxide of iron 0.54
Lime 1.72
Magnesia 1.55
Phosphoric acid 4.27
Sulphuric acid 0.24
Potash 1.19
Soda 0.31
Chloride of sodium 0.18
------
100.00

In a sample analyzed by myself there were found--

Organic matter 86.75
Phosphates 8.19
Alkaline salts, containing 1.18 of phosphoric } 2.53
acid }
Insoluble matters 2.53
------
100.00

Nitrogen 4.59
Equal to ammonia 5.57

It is to be observed that the urine and dung of animals differ
conspicuously in the composition of their ash, the former being
characterized by the abundance of alkaline salts, while the latter
contains these substances in small proportion, but is rich in earthy
matters, and especially in phosphoric acid. Salts of potash, for
example, form nine-tenths of the inorganic part of the urine of the ox,
while less than three per cent of that alkali is found in its dung.
Phosphoric acid, on the other hand, is not met with in the urine, but
forms about ten per cent of the dung. Silica is the most abundant
constituent of the dung, but a large proportion of that found o