--subdivision Physiological aspects under activities and mental conditions for works on the relationship between an individual's activity or mental state and his physiology, e.g. Soccer--Physiological aspects; Mental illness--Physiological aspects; also subdivision Physiological effect under individual chemicals and groups of chemicals and under environmental phenomena or conditions for works on their effect on the functions of living organisms, e.g. Copper--Physiological effect; Heat--Physiological effect; also subdivision Physiology under individual animals and groups of animals, organs and regions of the body, classes of persons, and ethnic groups, e.g. Fishes--Physiology; Heart--Physiology; and subdivision Embryos--Physiology under individual animals and groups of animals, e.g. Cattle--Embryos--Physiology
Animal pictures -- See Animals Pictorial works Here are entered popular works containing chiefly pictures and photographs of animals. Scientific works consisting exclusively or predominantly of pictures without a significant amount of text are entered under Zoology--Pictorial works.