It may be white, from crystallized carbonate of lime; brown, red, or even black, from the presence of blood or blood-coloring matter; yellow, from biliary coloring matter; frothy, from contained albumin; cloudy, from phosphates; glairy, from pus; it may also show gritty masses from gravel.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Even in our own day all of the physiological problems in the functions of biliary secretion are not solved.
"Makers of Modern Medicine"
James J. Walsh
Thus, because in certain animals he found a double biliary duct, he concluded the same to be the case in man, and in one instance he proceeded to deduce the cause of disease from this erroneous assumption.
"Fathers of Biology"
Charles McRae