Bottom ley . — The Root-nodules of Myrica Gale . 
ii 7 
Literature cited. 
Brunchorst, J. : Uber einige Wurzelanschwellungen. Unters. aus dem bot. Inst. z. Tubingen, 
Bd. ii, 1886. 
Bottomley, W. B. : The Cross-inoculation of the Nodule-forming Bacteria from Leguminous and. 
Non-leguminous Plants. Report Brit. Assoc., 1907. 
Hellriegel: Unters. iiber d. Stickstoffnahrung. Landw. Vers.-Stat., Bd. xxxiii, 1886. 
Hiltner, L. : Uber die Bedeutung der Wurzelknollchen von Alnus. Landw. Vers.-Stat., Bd. xlvi, 
1896. 
Marshall Ward, H. : Symbiosis. Annals of Botany, vol. xiii, no. lii, 1899. 
Moller, H. : Beitrage zur Kenntnis der Frankia subtilis. Berichteder Deutsch. Bot. Ges., Bd. vii, 
1889. 
Nobbe and Hiltner : Die endotrophen Mykorrhiza von Podocarpus . Landw. Vers.-Stat., Bd. Ii, 
1899. 
Peklo, J. : Die pflanzlichen Aktinomykosen. Cent. f. Bakt. II., Bd. xxvii, 1910. 
Shibata, K. : Cytologische Studien uber d. endotrophen Mykorrhiza. Jahrb. f. wiss. Bot., 
Bd. xxxvii, 1902. 
Tubeuf, K. F. : Diseases of Plants. English Edition, 1897. 
EXPLANATION OF FIGURES IN PLATES XI AND XII. 
Illustrating Prof. Bottomley’s paper on the Root-nodules of Myrica Gale. 
Fig. 1. Photograph of root and nodules of Myrica. Natural size. 
Fig. 2. Photograph of ‘cluster’ nodule, x 5. 
In the following figures c. denotes cork; b. } bacterial cells; o. } oil-drops; <?., endodermis; 
b., pericycle ; ph ., phloem; x., xylem ; m., meristematic zone. 
Fig. 3. Transverse section of nodule, showing the tetrarch main stele, x 70. 
Fig. 4. Transverse section of nodule, showing the stele producing three branches, p.x. denotes 
protoxylem ; br ., branch of stele, x 70. 
Fig. 5. Transverse section of nodule near the apex, showing the main vascular bundle ( m.b .), 
which is continued into the emerging root, and the three branches of the bundle ( br.b .) which 
supplies the branches of the nodule, x 70. 
Fig. 6. Longitudinal section of the root-nodule, showing the branched vascular tissue and the 
emerging rootlet ( r .) passing through the broken tip of the nodule (A), x 70. 
Fig. 7. Transverse section of the rootlet which has emerged from the tubercle, x 140. 
Fig. 8. Section of the cortical cells of the nodule, showing the Bacteria ( b.r .) and the infection 
threads {id.), n. denotes nucleus of host cell, x 325. 
