“Animal flesh, when used as an aliment, requires more atmospheric oxygen, and hence it is necessary for a carnivorous animal to accelerate respiration by motion. A tiger, which lives entirely on a flesh diet, moves to and fro even when confined in an iron cage, in order to consume the more oxygen from the air. For an amount of meat containing one grain of carbon, the animal must inhale 2.257 grains of atmospheric oxygen.

“One living upon cow’s-milk must inhale 2.144 grains of atmospheric oxygen for a quantity of the nutritious fluid containing one of carbon. He should be less active than one living upon a flesh diet. A person who lives upon barley consumes 1.753 grains of atmospheric oxygen for a quantity of the aliment containing one grain of carbon. He that lives upon wheat consumes 1.686 grains of atmospheric oxygen for a quantity of the aliment yielding one grain of carbon. One living upon rice requires 1.665 of atmospheric oxygen for a quantity of the aliment containing one grain of carbon.”