174 NOTES 



wirkung und Desinfektion, Zeitschr. f. Hygiene xxv, 1897. These works contain 

 the first exact description of the relation between the poisonousness of a solution 

 and its degree of dissociation. 



56. (p. 85). For the new theories of dissociation see Ostwald, Grundriss der allgemeinen 



Chemie, 2nd ed., and more fully in the same writer's Lehrbuch der allg. 

 Chemie, 2nd ed. 



57. (p. 87). Review of a Russian work by Kurloff and Wagner, Ueber die Ein- 



wirkung des menschlichen Magensaftes auf krankheits-erregende Keime, 

 Centralbl. f. Bakt. 1890, vol. vii ; also Hamburger, Ueber d. Wirkung des 

 Magensaftes auf pathogene Bakterien, Centralbl. f. klin. Medic. 1880. 



58. (p. 87). Cadeac and Bournay, R61e microbicide des sues digestifs et contagion par 



les matieres fecales (La province me'dicale, viii, 1893, referred to in Centralbl. f. 

 Bakt. vol. xvi, 1894, p. 672). 



59. (pp. 89, 91). Hellriegel and Willfarth, Untersuchungen iiber die Stickstoff- 



nahrung der Gramineen und Leguminosen, 1888, Beilageheft zu der Zeitschr. d. 

 Vereins f. d. Riibenzucker- Industrie des Deutschen Reiches. 



60. (p. 89). For the anatomy and development of the root-nodules see : WORONIN, 



Ueber die bei der Schvvarzerle und der gewohnlichen Lupine auftretenden 

 Wurzelanschwellungen, Mem. de l'Acad. imp. Petersburg, 7. Serie, vol. x, 

 1866. Beyerinck, Die Bakterien der Papilionaceenknollchen, Bot. Zeit. 1888, 

 and Centralbl. f. Bakt. vol. xv, 1894 ; B. Frank, Ueber die Pilzsymbiose der 

 Leguminosen, Landwirtsch. Jahrb. 1890 ; Prazmowski, I.andwirtsch. Ver- 

 suchsstation, 1890, vols, xxxvii and xxxviii. GONNERMANN, Die Bakterien in 

 den Wurzelknollchen der Leguminosen, Landwirtsch. Jahrb. vol. xxiii, 1894. 

 [See also Dawson, Phil. Trans., vol. exeii, 1899, p. 1, with references.] 



61. (p. 92). Beyerinck, Over ophooping van atmospherische stickstof in culturen von 



Bacillus radicicola, Akad. d. Wissensch., Amsterdam 1 891 ; reviewed in KOCH'S 

 Jahresber. vol. iii. p. 205, Maze, Fixation de l'azote libre par le bacille des 

 nodosite's des Le"gumineuses, Annales Pasteur xi, 1897. 



62. (p. 92). Nobbe, Hiltner, and Schmid, Versuche iiber die Biologie der Knoll- 



chenbakterien der Leguminosen, insbesondere iiber die Frage der Arteinheit 

 derselben, Landwirtsch. Versuchsst. voLxlv, 1895. Nobbe and Hiltner, Ueber 

 die Anpassungsfahigkeit der Knollchenbakterien ungleichen Ursprungs an ver- 

 schiedene Leguminosengattungen, ibid. vol. xlvii, 1896. In these papers will be 

 found the experimental evidence for Nitragin. 



63. (p. 95). If Frank's assertion that there are no intercellular spaces in the bac- 



teroidal tissue and that therefore free nitrogen cannot enter were true, then 

 it would be equally impossible for oxygen to get into these parts of the root- 

 nodules, which would be therefore anaerobic ! A careful examination of any 

 transverse section shows just the reverse, as might be expected. 



64. (p. 96). Winogradsky, Sur l'assimilation de l'azote gazeux de l'atmosphere par 



les microbes, Comptes rendus der Pariser Akad. 1893, vol. cxvi. p. 1385 ; 1894, 

 vol. cxviii. p. 353 ; and a collective Review in Archives des sciences biologiques, 

 vol. iii, 1895, St. Petersburg (referred to in Bot. Zeit. 1895). 



65. (p. 97). New light has been thrown on this matter by Kossowitsch, Untersuch- 



ungen iiber die Frage, ob die Algen freien Stickstoffassimilieren, Bot. Zeit. 1894. 

 The experiments of Schloesing and Laurent (Ann. de 1'Inst. Pasteur, 1892) 

 are here critically discussed. 



