560 Ward. — Symbiosis. 
7 . Le Dantec : Recherches sur la Symbiose des Algues et des Protozoaires : 
Ann. Inst. Pasteur, t. vi, 1892, p. 190, with literature. 
8. Frank : Lehrbuch der Botanik, Bd. i, pp. 259-275, with Bibliography to 1892. 
Also Tubeuf : Diseases of Plants (Engl. Ed.), 1897, pp. 92-103. 
MacDougal : Symbiotic Saprophytism : Ann. Bot., 1899, vol. iii, pp. 1-48, 
with literature. 
Lang: The Prothallus of Lycopodium clavatum : Ann. Bot., 1899, vol. xiii, 
pp. 291-296. 
9. Marshall Ward : On the Tubercular Swellings on the Roots of Vicia Faba : 
Phil. Trans. 1887, p. 539. 
Marshall Ward: New Aspects of an Old Agricultural question: Science 
Progress, vol. iii, 1895, p. 251, and literature to date. 
Miss Dawson : Nitragin and the Nodules of Leguminous Plants : Phil. Trans, 
vol. cxcii, B. 1899, p. 1-28. 
10. Hellriegel and Willfarth : Zeitschrift f. Rubenzucker-Industrie, Nov. 
1888, and Bericht : Wien, 1890. 
11. Recherches sur la fixation de P Azote libre par les plantes : Ann. Inst. Pasteur, 
1892. 
12. See Tubeuf: Diseases of plants (Engl. Ed.), 1897, p. 99, for literature. 
13. Marshall Ward : Symbiosis and Symbiotic Fermentations : Trans. Inst, of 
Brewing, 1892, vol. v. p. 59. 
Marshall Ward : Some Brewing Botanical Problems : Journ. Federated 
Institutes of Brewing, vol. iv, 1898, p. 334. 
14. Marshall Ward : The Ginger-Beer Plant, and the Organisms composing 
it : Phil. Trans. 1892, p. 125, with literature. 
15. Freudenreich : Centralblatt f. Bakt., 1897, Bd. iii, p. 47. 
16. Van Senus : Bijdrage tot de Kennisder Cellulose-gisting : Leiden, 1890. See 
Koch’s Jahresbericht, 1890, p. 136. Also Lafar, Technical Mycology, 
vol. i, 1898 (Engl. Ed.), pp. 193-198. 
17. Marshall Ward : Address to the Botanical Section, British Assoc., Toronto, 
1:897. 
Winogradsky : Archives des Sc. Biol, de l’lnstitut Imp. de Med. Expt., 
St.-Petersbourg, v. iii, p. 297, and Ann. de l’lnst. Pasteur, 1890. 
Warington : Journ. Chem. Soc., 1891, p. 484. 
18. Kosai and Yabe : Ueber die bei der Sakebereitung beteiligten Pilze : 
Centralbl. f. Bakt., Abth. 2, vol. i, 1895, p. 619. 
19. Vuillemin : Association Franfaise pour l’Avancement des Sciences, 1889. 
20. Garre : Ueber Antagonisten unter Bakterien. Correspondenzblatt fiir 
Schweitzer Aertze, 1887, xvii. 
Freudenreich: Ann. de l’lnstitut Pasteur, 1888, p. 200. 
Further references are collected in Sachs : Physiology of Plants (Engl. Ed'.), 
1 887, pp. 391-394. Frank : Lehrbuch der Botanik, 1892, Bd. i, pp. 274-5. 
Tubeuf: Diseases of Plants (Engl. Ed.), 1897, pp. 540-547. Kerner : 
Natural History of Plants (Engl. Ed.), passim. Also in the works of 
Fischer, Migula, and Lafar cited below. 
21. Poore has given an excellent resume in hisMilroy Lectures. Lancet, February 
and March, 1899. 
22. Woronin : Ueber die Sclerotienkrankheit der Vaccinieenbeeren : Mem. de 
l’Acad. Imp. des Sc. de St.-Petersb., t. xxxvi, 1888. 
