[66] A most singular sign of this function is given to the chemistry of the changes, according to a French botanist, to whose carefully and richly illustrated volume I shall in future often refer my readers, "Vers l'époque de la maturité, les fruits exhalent de l'acide carbonique. Ils ne presentent plus dès lors aucun dégagement d'oxygène pendant le jour, et respirent, pour ainsi dire, à la façon des animaux."—(Figuier, 'Histoire des Plantes,' p. 182. 8vo. Paris. Hachette. 1874.)
[67] 'Elements of Chemistry,' p. 44. By Edward Turner; edited by Justus Liebig and William Gregory. Taylor and Walton, 1840.