j. arthur thomson

AN INTRICATE COLONY OF OPEN-SEA ANIMALS (Physophora Hydrostatica) RELATED TO THE PORTUGUESE MAN-OF-WAR

There is great division of labor in the colony. At the top are floating and swimming “persons”; the long ones below are offensive “persons” bearing batteries of stinging cells; in the middle zone there are nutritive, reproductive, and other “persons.” The color of the colony is a fine translucent blue. Swimmers and bathers are often badly stung by this strange animal and its relatives.

The Theory of Electrons

An atom of matter is composed of electrons. We picture an atom as a sort of miniature solar system, the electrons (particles of negative electricity) rotating round a central nucleus of positive electricity. In the above pictorial representation of an atom the whirling electrons are indicated in the outer ring.

From the book: The Outline of Science, Vol. 1, J. Arthur Thomson  (1861 - 1933)