The coloring matter in fat from cow's milk

Text from page 1: The great variety of coloring matters that exist throughout the entire plant and animal kingdoms have long been of interest to scientists. From the standpoint of both the chemist and the physiologist a great deal of investigation has been carried on to determine the chemical constitution, the cause, and the function of these various pigments. To greatly increase the interest in this work it has been discovered within the last few years that a definite relationship exists between a number of the animal and vegetable pigments.