Sodium chloride and sodium sulphate 2·1 Sodium ammonium phosphate 14·0 Earthy phosphates, principally Ca_{3}(PO_{4})_{2} 33·6 Ferric phosphate 0·87 Calcium sulphate 1·94 Silicic acid 3·40 Calcium in solution as CaO 1·42 Total P_{2}O_{5} in solution 4·00 Non-volatile acids (as lactic) 3·00 Volatile acids (as acetic) 2·20 Amines (as ammonia) 6·20 Enzymes 3·66 Nitrogenous bodies not included in the above, consisting of complex amido-acids, leucin, tyrosin, xanthin, and other purine bases, indol and skatol 17·00 Organic matter, cellulose, etc. mostly insoluble, including fats and soaps 70·00 On the dry matter the amounts extracted by various solvents were:-- Per cent. Water 24·03 Alcohol 22·27 CS_{2} 15·57 C_{2}HCl_{3} (Tri-chlorethylene) 14·45 Petrol. ether 13·23 No carbohydrates (sugars) capable of reducing Fehling’s solution were found in the puers examined. The ash[22] of the dry fæces from dogs fed on a flesh diet varies from 20 to 34·27 per cent., with the following percentage composition:-- [22] Gaultier. See also analysis given in Chapter VI. Silica 7·04 CO_{2} 4·62 SO_{3} 7·37 Fe_{2}O_{3} 4·22 CaO 25·29 P_{2}O_{5} 26·41 MgO 15·52 Cl 1·50 Alkali 5·53 In a dog weighing 30 kilos., fed on a mixed diet of 500 grm. meat and 200 grm. starch, 78·6 grm. dry fæces were obtained containing 23·76 per cent. ash of the following percentage composition:-- CaO 22·3 P_{2}O_{5} 25·4 Fe_{2}O_{3} 10·6 MgO 9·8 SO_{3} 5·0 Cl 0·2 Alkali 1·1 Insol. in HCl 21·8 It is obvious that the composition of the fæces will vary with the food given, and in this connexion it may be stated that the puer used was obtained from dogs fed on a mixture of boiled horseflesh and oatmeal porridge, about equal quantities. Sometimes charcoal and cabbage are mixed with the food, in this case the puer is very dark coloured. The dark colour so produced is to be carefully distinguished from the dark colour caused by decomposition of the puer.