Albuminoids

Albuminoids, or Protein Compounds, a class of bodies which are particularly associated with the living activity of plants and animals. Albumin and fibrin in blood; casein in milk; syntonin in muscle; and vitellin in yolk of egg, are important examples of a series of substances which are so similar in their ultimate chemical composition as to suggest (Gerhardt) that they all contain an identical principle, which by its capability of assuming varied forms of aggregation or of associating itself with mineral substances, is able to give rise to many apparently diverse bodies.