ABSORPTION OF GASES. 87 



Occasionally other gases, such as sulphur dioxide, sulphu- 

 retted hydrogen, and hydrochloric acid, are present in the air 

 in the neighbourhood of chemical works. The plants of the 

 district very soon become unhealthy and die, so there is 

 reason to believe that these gases are absorbed by the leaves. 



BIBLIOGRAPHY. 



Stahl ; Anatomic etc. der Lenticellen, Bot.-Zeitg., 1873. 



Unger; Flora, 1837. 



Boussingault ; Fonctions des Feuilles, Agronomic IV, 1868. 



Barthdlemy ; Ann. d. sci. nat, seV. 5, t. XIX, 1874. 



Percival ; Memoirs of the Lit. Phil. Soc. of Manchester, n, 1789. 



de Saussure ; Recherches chimiques, 1804. 



Godlewski ; Arb. d. hot. Inst. in Wiirzburg, I, 1873. 



Boussingault ; loc. cit. 



Bert ; La Pression Barome'trique, 1878. 



Absorption of Oxygen. 



Priestley ; On Air, vol. I, 1779. 



Ingenhousz ; Experiments upon Vegetables, 1779. 



de Saussure ; loc. cit. 



Pasteur ; Ann. sci. nat. (Zoologie), s6r. 4, t. xvi, 1861. 



Marcet; Bibl. Univ. de Geneve, LXII, 1834. 



Wolkoff and Mayer; Landwirthsch. Jahrb., Ill, 1874. 



de Saussure ; Froriep's Notizen, xxiv, 1842. 



Oudemans and Rauwenhoff; Linnaea, xiv, 1859. 



Fleury ; Ann. d. China, et de Phys., sdr. 4, t. IV, 1865. 



Lory ; Ann. sci. nat., sdr. 3, t. VIII, 1847. 



Drude; Biol. von Monotropa und Neottia, Gott, 1873. 



de Saussure; Ann. d. Chim. et de Phys., xxi, 1822. 



Dehe'ram and Vesque ; Ann. d. sci. nat., sdr. 6, t. in, 1876. 



Garreau ; Ann. d. sci. nat, se'r. 3, t. XV, 1851. 



Absorption of Carbonic Dioxide. 



De la Hire ; Memoires de 1' Academic, 1690. 



Bonnet ; L'Usage des Feuilles, 1754. 



Priestley : Phil. Trans., 1772. 



Se'ne'bier; Recherches, 1783. 



de Saussure ; Recherches chimiques, 1804. 



Boussingault ; Economic rurale, I, 1844. 



Vogel and Wittwer ; Abhandl. d. k. bayr. Akad., VI, 1852. 



Rauwenhoff; Onderzoek, etc., Amsterdam, 1853. 



