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THE MOTION PICTURE STORY MAGAZINE.
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in a single drop of water, to the mastodon, or the whale, the variations are almost infinite :
Many organisms living in or npon others, in its benign form being called commensalism, a partnership for mutual benefit, illustrated best in the hermit crab and the sea anemone; the anemone being attached to the back of the crab, and obtaining a greater variety of food by being carried about, and when attacked, the crab
FEMALE COPEPODE CARRYING HER EGGS
retreating to safety within the shell of its partner.
A drop of water. What may it contain? How much can be learnt of its floating contents by the aid of the microscope, and how marvelously can this knowledge be amplified by the cinematograph. The best microscopes enlarge to about 1000 diameters. The development of this picture to a size of forty or fifty thousand diameters brings out the movements of the inhabitants of the sea or of the stagnant pools as clearly as if they were within the reach of ordinary eyes.
Necessarily the contents of a drop of water must be the natural habitat of the place whence the water is obtained. Even this is ever changing, for the natural processes of birth, develop
ment and decay go on in the microscopic forms with the same unceasing regularity as they do in the highest. Some forms of bacteria develop under culture so rapidly that billions may be the outcome of proper conditions daily.
In water from the ocean we find minute organisms that are related to the primitive amoeba, and up thru the classes that have shells, and in another direction thru the forms that are jellylike, of which the Portugese Man 7o War is probably the largest. The Copepode, the cyclops, or paleozoic fishes, are both fresh water and marine, with their five pair of feet, form some of the food that whales like to draw into their mouths in great numbers :
Daphnia, sometimes called the water flea, some varieties of which color the water red and when in great numbers give it a bloody appearance; ostracode, related to the daphnia, which swim actively by means of their antennas; rotifer, the wheel animalculse, which are not far from the lowest order of worms, and whose rows of cillia,
A DAPHNIA.
or hair like processes, give them a rotary motion in the water ; and euglena viridis, abundant in fresh water pools, whose presence colors the water green. It is a branch of this numerous family which float on the surface of the waters