572 BACTERIAL DISEASES OF PLANTS 



chemistry, for these are the sister sciences which, when joined 

 to physiology and pathology, may be counted upon to solve 

 the problem of the cause of malignant human and animal tumors. 

 The time is ripe and I believe the solution of the problem is very 

 near. The elimination of the disease, however, will be much 

 more difficult. 



LITERATURE 



1886. SORAUER, PAUL. Handbuch der Pflanzenkrank- 

 heiten. 2te neubearbeitete Auflage. Erster Theil. Blattauf- 

 treibung (Intumescentia) pp. 222-227. Berlin, Paul Parey. 

 1886. 



1889. ATKINSON, GEO. F. Nematode Root-galls. Science 

 Contributions from the Agricultural Experiment Station, Ala- 

 bama Polytechnic Institute, Auburn, Ala., December, 1889, 

 Vol. I, No. 1, Bulletin No. 9, New Series, pp. 177-226, 6 Plates. 



1893. ATKINSON, GEORGE F. (Edema of the Tomato. Cor- 

 nell Univ. Agric. Exp. Sta., Bulletin 53, May, 1893. 



1893. ATKINSON, G. F. (Edema of Apples Trees. New 

 York (Cornell) Agricultural Experiment Station, Bulletin 61, 

 December, 1893. Published by the Univ., Ithaca, N. Y., pp. 

 299-302, Figs. 1 and 2. 



1898. TUBEUF, C, VON (see p. 631). 



1904. VIALA, P. and PACOTTET, P. SurlesVerruesdesfeuilles 

 de la Vigne. Comptes Rendus des Seances de I'Academie des 

 Sciences. Tome 138, Janvier, 1904, pp. 161-163. 



1905. VON SCHRENK, HERMANN. Intumescences Formed as 

 a Result of Chemical Stimulation. Missouri Botanical Garden, 

 16th Ann. Rpt. St. Louis, Mo., 1905, pp. 125-148. 7 Plates. 



1909. SORAUER, PAUL. Handbuch der Pflanzenkrank- 

 heiten. Dritte, vollstandig neubearbeitete Auflage, Erster Band. 

 Die nichtparasitaren Krankheiten. Fiinftes Kapitel. Ubermas- 

 sige Luftfeuchtigkeit, pp. 435-449. Berlin, Paul Parey, 1909. 



1910. MOLLIARD, MARIN. Sur quelques caracteres histolo- 

 giques des Cecidies. Produites par 1'Heterodera radicicola 

 Greff. Revue generate de Botanique, Tome 12, Paris, 1900, pp. 

 157-165, 1 PI. 



1910. NEMEC, PROF. DR. B. Das Problem der Befruchtungs- 



