PLANT BACTERIA-VOL. s. 



PLATE 23. 



TOBACCO WILT. POTATO DISEASE. RATHAVS DISEASE. 



(1) Litmus milk culture. 12 days old, of Barilla* laltmitajtmi I. Painted March 19, 1907. (la) Litmus-mljk culture 12 days. 

 old. of RncUltu nhH'oiMhartu. Inoculated and painted at same time as fig. 1. (2) Old browned colonies on the surface of an agar 

 plate of the N. C. tobacco organism, poured August 1, 1905, painted October 14; agar stained brown. (3) Litmus-milk culture of 

 Appel's Hiirillut i>Ayr"i>A/Ariu. Tube inoculated November 13; 1906. Painted November 26. (4) Uninoculated (check) tube of 

 litmus-milk. (5) Jiatillui tolanitinirtu Harrison I. An old litmus-milk culture kept in the refrigerator (14C.) and partly dried out. 

 Inoculated December 10, 1906; painted March 4, 1907. (6) Old potato-culture of Barilla* ( >Av/i>AfAnu Appel. Stock 1975, painted 

 March 5. 1907. (6n) Potato-culture of HaHlliu mlnnitanruj Harrison II. Inoculated March 7, 1907, and painted March 19. The 

 color close, but the organism wet-shining. (7) An old litmus-milk culture of Hurt, mlanacrarum, Florida potato, tube inoculated June 2, 

 1905, painted August 28 and equally representative of an old culture of the N. C. tobacco organism. (8, 10) Cross-sections of 9 and 11, 

 showing the characteristic bacterial decay. (9, 11) Internally brown rotted potato tubers from Portsmouth, Va., painted October 18-19, 

 1905. Infection by way of the vessels of the rhizome; the surface of the tuber not ruptured: Hart. jcWarximirum very abundant in 

 the vascular system of rhizomes and tubers. (12. 13) Aplanobactrr ruthaui; milk and litmus-milk, 5 months. 



