574 BACTERIAL DISEASES OF PLANTS 



Crown gall. Journal of Agricultural Research, Vol. VIII, No. 

 5, January 29, 1917, pp. 165-186. 



1917. SMITH, ERWIN F. Embryomas in Plants. (Produced 

 by Bacterial Inoculations.) Johns Hopkins Hospital Bulletin, 

 Vol. XXVIII, No. 319, September, 1917, pp. 277-294. 115 

 Figures on 14 Plates and 1 text Fig. Also a repaged separate. 



1918. WOLF, F. A. Intumescences, with a Note on Mechan- 

 ical Injury as a Cause of their Development. Journal of 

 Agricultural Research, Vol. XIII, No. 4, April 22, 1918, pp. 

 253-259. 



1918. MACCARTY, WM. C. Cancer's Place in General 

 Biology. The American Naturalist, Vol. LII, Nos. 620-621, 

 August-September, 1918, pp. 395-408. 7 Figs, in text. 



1918. KUNKEL, L. O. Tissue Invasion by Plasmodiophora 

 Brassicae. Jour. Agr. Research, Vol. XIV, No. 12, Sept. 16, 

 1918, pp. 543-572. 20 Plates. 



1918. HARVEY, R. B. Hardening Process in Plants and 

 Developments from Frost Injury. Journal of Agricultural 

 Research, Vol. XV, No. 2, October 14, 1918, pp. 83-111. 



(See also Literature references under Crown gall, Part III.) 



V. ON THE PRODUCTION OF TERATOSIS IN THE ABSENCE 

 OF TUMORS AND OF PARASITES 



For several years I have been experimenting on the cause 

 of excessive proliferation in plants, using for this purpose 

 Begonia phyllomaniaca (Fig. 425), and have obtained results 

 of general interest which may be expressed as follows, premising 

 that the plant is one that has been in cultivation for a long time, 

 is of doubtful origin and has been known since it was first 

 described by von Martius (in 1852) to throw adventive shoots 

 irregularly from its stems and leaves (Figs. 426, 427). It is 

 figured and described in Curtis' Botanical Magazine (Vol. 

 XVII, pi. 5254), in von Martius' " Flora Brasiliensis " (Vol. 

 IV, Part I, p. 386, Pis. 99, 100), and in various other places. 

 Von Martius says the plant was received at the Royal Botanic 

 Garden in Munich from a garden in Hamburg about the year 

 1848, without name and as of Brazilian origin, but he points 

 out that it belongs to a group of begonias which do not occur 



