The New Evolution: Zoogenesis

By Austin H. Clark | Go to book overview

CHAPTER IX
SPECIAL RELATIONSHIPS AND CONTACTS

THE broad relationships of animals to the world in which they live are often characterized by an extraordinary development of certain special contacts which may become the dominating and controlling influences to which all others are more or less subordinated. These special contacts are commonly overlooked, or at least minimized, and are not considered in their true import and perspective.

Perhaps the most interesting of these special contacts is that having to do with light. Light in some form and in some degree seems to be essential for all animal life. It may well be doubted whether any animal lives in absolute darkness. Those inhabiting deep subterranean streams appear to do so, but the subject has never been investigated. They certainly live in a minimum of light.

In the deeper portions of the sea there is no light, or at least no effective light. But sea creatures, especially those remaining always beneath the illuminated surface layer of water, are remarkable for the luminescence developed in all types save for a few that feed on luminescent organisms.

This general occurrence of luminescence among the creatures of the sea has never been satisfactorily explained. Luminescence is not known to occur in any

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