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It has been demonstrated by Moore and Webster that colloidal solutions, or suspensions, of salts or oxides of iron, in presence of dissolved carbon dioxide and with the energy supply of sunlight, possess the power of synthesising formaldehyde. Since this is known to be the first step in the process of organic synthesis of the substance of all living plants and animals from inorganic material and must, moreover, have occurred in past ages over immense areas of the earth’s surface before life began to exist on the planet, the conclusion was drawn that life must have originated by continual development of more and more complex organic substances from this simple commencement. It is in this first stage of all that the greatest production of chemical energy occurs, and accordingly a transformer of light energy into chemical energy is essential. Although the more highly organised carbohydrates and proteins still require catalysts for their synthesis, weight for weight they contain scarcely any greater storage of chemical energy than formaldehyde, and once an accumulation of organic material has been reached, even the fats and their allies can easily be synthesised by the combination of linked exothermic and endothermic reactions by the living cell acting as a transformer, without the use of external energy such as that of sunlight.

proceedings of the royal society of london. series b, containing papers of a biological character

The presence of inorganic iron compounds in the chloroplasts of the green cells of plants, considered in relationship to natural photo-synthesis and the origin of life