Thumb

Definition and stakes

Delaumosne,  Delsarte System of Oratory

“ Thus I was not slow to recognize that the contraction of the thumb is inversely proportionate, its extension directly proportionate to the affectional exaltation of the life. "No doubt," I said to myself, "the thumb is the thermometer of life in its extending progression as it is of death in its contracting progression." ”
Source: Gutenberg

Anonymous,  The Hand Phrenologically Considered

“ A pallid or yellowish colour of the furrows marking the palm is indicative of disease.
Thumb.—The thumb deserves particular notice in treating of the hand. It is the presence of a thumb that imparts to the hand of the higher animals its character of superiority. It is the higher developement and greater mobility of the human hand that render it so much more perfect than that of the ape: “L’animal supérieur est dans la main, l’homme est dans la pouce,” says D’Arpentigny.
”
Source: Gutenberg

Portrait of J. Schuyler Long J. Schuyler Long,  The Sign Language (1918)

“ Father.—With fingers closed and thumb extended, place thumb at the right side of the forehead and at right angles to it; with a slightly twisting motion, bring hand away, opening fingers and turning palm upward; at the same time bring the left hand up similarly and place parallel to the right as if lifting up a babe. ”
Source: Wikisource

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