Diogenes Of Apollonia, a Greek philosopher, born at Apollonia in Crete, flourished in the 5th century B. C. Very little is known of his life. He was at Athens probably about 460, and became involved in some trouble there. His philosophical speculations were developed in his workDiogenes Of Apollonia 060048 " On Nature," which was extant in the 6th century. His great object was to find the first principle of the world, and he came to the conclusion that air of various degrees of condensation formed the atmosphere, fire, water, and earth, and out of these everything else was evolved ; and he endowed this first principle with a certain intelligence, presiding over the arrangement of the universe, the marks of which are visible in the order and beauty of creation. The brutes, he says, are inferior to man because they inhale an air less pure, holding their heads near the ground. The world, too, he supposed to be animated, and he imagined the stars to be its organs of respiration. The few fragments of Diogenes which have come down to us (in the works of Aristotle, Diogenes Laertius, and Simplicius) were published by Panzerbeiter (Leipsic, 1830).