Chapter Xiv., the Reader Should Consult Dale "on Certain

Outgrowths (Intumescences) on the green parts of Hibiscus," Proc. Cambr. Phil. Soc., Vol. X., 1899, p. 192, and Brit. Ass. Rep., Bradford, 1900.

The detailed study of the anatomy and histology of Galls has been recently undertaken by Kuester, "Beitrage zur Kenntniss der Gallenanatomie," Flora, B. 87, 1900, p. 117, where the principal references will be found.

On the root-galls due to Nematodes see Atkinson in Science Contributions from the Agric. Expt. Station, Alabama, Vol. I., p. 1, 1889; Percival, "An Eel-worm disease of Hops" in Natural Science, Vol. VI., 1895, p. 187; and Molliard in Revue generale de Botanique, Apl., 1900, p. 157, where the histology is dealt with.

The nodules of the roots of Leguminoseae are not part of the subject of this work: the literature is collected in Science Progress, 1895, Vol. III., p. 252, and Dawson, Phil. Trans., 1900.