NEW CELL FORMATIONS IN PLANTS 295 



(2) Rumbold, Caroline "Methods of Injecting Trees." Phytopathology 1915- 



V, 225-229. 



(3) Rumbold, Caroline "Pathological Anatomy of the Injected Trunks of Chest- 



nut Trees." Proc. Amer. Phil. Soc, 1916: LV, 485-493. 



(4) Schilberszky, Karl "Kunstlich hervorgerufene Bildung secundarer (e.xtra- 



faszikularer) Gefassbiindel bei Dicotyledonen " Ber. d. 

 D.botGes., 1892: X, 424. 



(5) Simon, S. "Experimentelle Untersuchenen uber Differenzierungs- 



vorgange im Callusgewebe vom Holzgewachsen. " Jahrb. 

 f. wissen. Bot., 1908: XLV, 351. 



(6) Smith, Erwin F. "Mechanism of Tumor Growth in Crown-Gall." Jour. 



Agr. Research, 1917: VIII, 165-186. 



(7) Solereder, Hans "Systematic Anatomy of the Dicotyledons." English 



Translation, Revision of D. H. Scott, Clarendon Press, 

 Oxford, 1908. 



(8) Strasburger, Edward "Textbook of Botany. " 4th English Edition, Macmillan, 



London, 1912. 



(9) deVries, H. "Uber Wundholz." Flora, 1896: LIX, S. 2, 17, 38,49, 



81, 97, 113, 129. 



EXPLANATION OF PLATES 



PLATE LXXI— TYPICAL CASTANEA TRUNKS FROM AMONG THOSE 



EXAMINED 



Fig. 1. The hole made for the injection may be seen at "a." The effect of the in- 

 jection was barely visible as far up as "b." The saw cuts for the pre- 

 liminary examination may be readily seen. Injection 32. 



Fig. 2. Injected in 1914 with Lithium Hydrate 1 :100 Gram-Molecular concentra- 

 tion. This killed the bark for a considerable distance above and 

 below the points of injection 'V"-"c." Xylem-cambial activity was 

 visible as far as the top of the part of the specimen shown, and material 

 for histological examination was taken from "d." It is shown in Plate 

 LXXIII, Fig. 8. Injection 20. 



Fig. 3. From a part of the specimen not reached by the injection. There is shown 

 here a healing wound resulting from the removal of a blight infection. 

 Xylem formation from xylem-cambia had occurred, showing well in material 

 from "e." Injection 21. 



Fig. 4. A similar case. The normal callus is shown at "/." The included hard- 

 bast strands were to be seen to the top of the part of the specimen figured. 

 Injection 31. 



PLATE LXXII— THE PHLOEM, NORMAL AND MODIFIED— C^^jT^A^^^ 



Fig. 5. Normal Phloem— Transverse Section. The hard-bast of two rings is shown 

 at " a. " The dark row of cells that surrounds each of the hard-bast strands 

 is the layer of crystal cells. The soft-bast, "b," fills all of the space be- 



