Concept
Acorn

Overview
fruit/nut of the oak tree
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
In the original texts
Passages from public-domain books where Acorn is discussed.
The same author assures us also, that the acorn of the holm oak is a trying diet for swine, unless it is given in very small quantities at a time. He says, too, that this acorn is the last to fall, and that the flesh of swine, if fed upon the acorns of the æsculus, the robur, or the cork-tree, will be of a spongy nature.
the Elder Pliny, The Natural History of Pliny, Volume 3
names the idea; a chapter is titled for it; states what it is; opens on it
PARTHENOGENESIS.—The production of living organisms from unimpregnated eggs or seeds. PEDUNCULATED.—Supported upon a stem or stalk. The pedunculated oak has its acorns borne upon a footstool. PELORIA or PELORISM.—The appearance of regularity of structure in the flowers of plants which normally bear irregular flowers. PELVIS.—The bony arch to which the hind limbs of vertebrate animals are articulated.
Charles Darwin, The Origin of Species by Means of Natural Selection
states what it is; names the idea
And the oak, in truth, is the tree which bears the most and the prettiest fruit of any that grow wild, and is the strongest of all that are under cultivation; its acorns were the principal diet of the first mortals, and the honey found in it gave them drink. I may say, too, it furnished fowl and other creatures as dainties, in producing mistletoe for birdlime to ensnare them.
Plutarch, Plutarch
names the idea; opens on it
And the oak, in truth, is the tree which bears the most and the prettiest of any that grow wild, and is the strongest of all that are under cultivation; its acorns were the principal diet of the first mortals, and the honey found in it gave them drink.
Plutarch, The Boys' and Girls' Plutarch
names the idea
Development holds merely of the course of changes which takes place within a particular member of the species. It is only a name for the predetermined movement from the acorn to the oak tree.
John Dewey, Reconstruction in Philosophy
names the idea
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Place in the tradition
Part of Existence.