36 Graft- Infectioiis Disease of Datura 



PLATE VI. 



Fig. 10. Seedlings from Quercina Datura meteloides ; Q. at left, normal at right. 



Fig. 11. Stock of Quercina Jimson supporting a cion of Petunia which bears at its apex 



a normal Jimson cion. The Petunia has failed to transmit the infection from the 



Q. stock to the normal Jimson cion. 

 Fig. 12. Jimson Weed attacked by a contact infectious disease (Z) of the mosaic type. 



Youngest leaves are reduced to the midrib. 



BIBLIOGRAPHY. 



1. Allard, H. a. 1916. "A specific mosaic disease in JVicotiana viscosujn distinct 



from the mosaic disease of tobacco." Joum. Agr. Research, Vol. vii. 

 pp. 481—486. 



2. Bateson, W. and Saunders, E. R. 1902. Reports to the Evolution Committee of 



the Royal Society, Rep. I. pp. 21 — 32. 



3. Baur, E. 1906. "Ueber die infektiose Chlorose der Malvaceen." Sitzungsh. 



Kgl. preuss. Akad. d. Wissenseh. Bd. i. pp. 11 — ^19. 



4. Blakeslee, a. F. and Avery, B. T. 1917. " Adzuki Beans and Jimson Weeds." 



Journal of Heredity, Vol. viii. pp. 125 — 131. 



h. , 1919. "Mutations in the Jimson Weeds." Journal of Heredity, 



Vol. X. pp. 111—120. 



6. GoDRON, D. A, 1873. Des hyhrides et des metis de Datura (Nancy), pp. 1 — 75. 



7. Naudin, Ch. 1865. " Nouvelles recherches sur I'hybridite dans les vegetaux." 



Nouv Arch. Mus. Tom. i. pp. 41 — 54. 



8. DE Vries, H. 1900. " Das Spaltungsgesetz der Bastarde." Ber. Dent. Bot. 



Gesell. Bd. xviii. pp. 83—90. 



