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Tom. 19 p. 73. G. Cuvier remarks that true system of classification depends on taking organs of most influence, or most constant — says that Botanists are obliged to depend on constancy, because use of parts not well known in plants — constancy with zoologists being "moyen subsidiaires." — (I do not agree one iota, high as authority is. Jussieu & MIrbel were right in constancy going with connection of organs.)

Tom. XX. A. Risso Mem. sur l'Hist. des Orangers &c.

p. 188. Correlation "Citrus aurantium fructu variabilis" a var. of common orange, which has the leaves on new shoots rounded-oval "tachetees" spotted with yellow, & borne on petioles with heart-shaped wings; when these are fallen, they are succeeded by leaves more elongated, narrower & undulated, of a pale green "liserées" (bordered?) de jaune, situated on long petioles without wings — The front at first (ie when young) oblong, &c changes in form when ripe & are at first sweet & then become bitter. (The first fact good to quote to show change, from correlation of organization or external causes, & independent of selection &c.)

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References:

Cuvier, G. 1812. Sur un nouveau rapprochement à etablir entre les classes qui composent le Regne animal. Annales du Muséum national d'histoire naturelle 19: 73-84.

Risso, A. 1813. Memoire sur l'histoire naturelle des orangers, bigaradiers, limettiers, cedratiers, limoniers ou citroniers, cultives dans le departement des Alpes-Maritimes. Annales du Muséum national d'histoire naturelle 20: 169-212.