Chlorophyll would be a monopoly of the plant kingdom except for the muscling-in of a little-known group of microscopic water animals.* Unlike the 850,000 other species of animals, which live parasitically off the food-making ability of the plant world, these little creatures contain chlorophyll and hence can synthesize food out of water, carbon dioxide in the presence of light. And unlike any of the 250,000 species of plants, one of these animalsEuglena rubra by namechanges its color, now red, now green, to control the amount of light it uses. This phenomenon was explained last week in Physiological Zoology by Leland P....
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