BIOCHEMICAL INTERPRETATIONS
Copper is distributed in the soil the world over and enters into the composition of vegetables, cereals and fruits. A trace is found in the egg and one oyster contains about 8 milligrams of copper. The ash of the snail shows 2.4 per cent. of copper as an oxide. In this lower order hemocyanin (protein copper) corresponds to hemoglobin (iron pigment) in the higher animals and man and to chlorophyll (magnesium) in plant life.