So far as is at present known the unorganised ferments in the dung, besides those which are secreted by the bacteria, are mostly digestive ferments[114] --pepsin, pancreatin, and trypsin--certain quantities of which pass out of the animal’s body in an unchanged condition. Of these, _pepsin_ only acts in an acid solution, and, although fresh bate liquor is faintly acid to litmus, it quickly becomes neutralised by the lime in the skins, so that the action of this ferment can only be limited in extent. _Pancreatin_ will act in a neutral solution, and has, therefore, a considerable effect on the skin. [114] Harris and Gow, Jour. of Physiol., xiii. 469. G. Tammian, Zeitschr. f. Physiol. Chem., xv. 271. O. Loew., J. Prak. Chem., 37, 101. J.S.C.I., 1888, 224. SOME DUNG ANALYSES. --------------------------+--------------------+-------------------------- Hen Dung | Dog Dung | Guano --------------------------+--------------------+-------------------------- Per Cent. | Per Cent. | Per Cent. Moisture 60·88 | Ca 43·049 | Urea 5·00 Organic matter† 19·22 | Mg 0·087 | K_{2}SO_{4} 7·90 Phosphates 4·47 | K 0·302 | NaCl 5·00 CaCO_{3} and | Na 0·438 | (NH_{4})_{3}PO_{4} 5·50 CaSO_{4} 7·85 | Si 0·004 | (NH_{4})_{2}O 0·60 Alkaline salts 1·09 | PO_{4} 3·446 | SiO_{2} 2·25 Silica and sand 6·69 | CO_{2} 7·464 | Ca_{3}(PO_{4})_{2} 9·00 ------ | Cl 0·037 | MgNH_{4}PO_{4} 15·25 100.00 | Fe and loss 0·008 | Ammon. urate 15·25 | Organic | Organic matter | matter 14·152 | (17 per cent. N) 41·73 † Containing | H_{2}O 31·013 | Moisture 6·52 N = ammonia 0·74 | ------- | ------ | 100.000 | 100.00 --------------------------+--------------------+-------------------------- W. I. Macadam, J.S.C.I., 1888, 80. _Viollet_, Diction d’Analyses Chim. The dog dung actually used in a tannery is from animals fed on a more vegetable diet, the one given having an extremely high percentage of lime, no doubt owing to the animal having eaten bones. A dung as brought from the kennels was found to contain:-- Per Cent. Mineral matter 4·679 Organic " 9·731 Water " 85·590 ------ 100·000