J. Arthur Thomson

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)


As ants are much dreaded, it is probably profitable to the spider to be like an ant. It will be noted that the spider has four pairs of legs and no feelers, whereas the ant has three pairs of legs and a pair of feelers.

The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told

J. Arthur Thomson, 1922 (Source: gutenberg.org)

Image from page 180 of “From North pole to equator: studies of wild life and scenes in many lands” (1896)

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Title: From North pole to equator: studies of wild life and scenes in many lands
Identifier: cu31924081072922
Year: 1896 (1890s)
Authors: Brehm, Alfred Edmund, 1829-1884; Thomson, Margaret R. , tr; Thomson, J. Arthur (John Arthur), 1861-1933, ed
Subjects: Animal behavior; Birds; Tundras; Ethnology; Birds
Publisher: London [etc. ] Blackie & Son, Limited
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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Text Appearing Before Image:
THE STEPPES OF INNER AFRICA. 175 hundred paces beyond the last house of the towns, and directly behind the last houses of the villages; it includes the fields of the settlers, and suppoi'ts the flocks of the nomads. Where the desert ends to the south, where the forest ceases, where the mountain flattens, there is steppe-land; where the forest is destroyed by fire,

Text Appearing After Image:
Fig. 25.—The Eed of an Internnttent Kivei’. Central Afr the steppe first gains possession of the clearing; where men abandon a village the steppe encroaches, and in a few years destroys every trace of habitation; where the farmer relinquishes his fields the steppe impresses its character upon them in the space of a year or two. Inhospitable and monotonous the steppe seems to one who sees it for the first time. A wide, often immeasurable plain stretches before his eye; only exceptionally is this interrupted by isolated conical hills, yet more rarely do these unite to form mountain ranges. More frequently, low, undulating hills alternate with flat valleys; or sometimes they combine in a strange mazy network of ranges

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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.