Reaction Alkaline. Contains 3 to 4 per cent. of fat } Sp. gravity “ 6 to 7 “ “ of sugar } 1030. “ 1 to 2 “ “ of proteids} Inorganic materials ¹/₁₀ to ²/₁₀ of 1 per cent. Average percentage, 12 per cent. of solids to 88 per cent. of water.