Jan. 29,1917 
Mechanism of Tumor Growth in Crowngall 
185 
The bacterium used for these flask cultures was the original hop 
strain kept for a long time in the laboratory without passage through 
plants (9 years), but was still infectious. That used for the first set 
of hop flasks (which were only 2 weeks old) was the same strain but 
after passage through sunflower in 1915. 
LITERATURE CITED 
(1) Smith, E. F., and Townsend, C. O. 
1907. A plant-tumor of bacterial origin. In Science, n. s., v. 25, no. 643, 
p. 671-673. 
(2) - Brown, N. A., and Townsend, C. O. 
1911. Crown-gall of plants: its cause and remedy. U. S. Dept. Agr. Bur. 
Plant Indus. Bui. 213, 215 p., 3 fig., 36 pi. 
(3) Smith, E. F. 
1911. Crown gall of plants. In Phytopathology, v. 1, no. 1, p. 7-11, 
pi. 2-3. 
(4) -Brown, N. A., and McCulloch, L. 
1912. The structure and development of crown gall: a plant cancer. U. S. 
Dept. Agr. Bur. Plant Indus. Bui. 255, 60 p., 2 fig., 109 pi. 
<5) Smith, E. F. 
1916. Tumors in plants. In Science, n. s., v. 44, no. 1139, p..611-612. 
( 6 )- 
1916. Crown gall and cancer. In Jour. Amer. Med. Assoc., v. 67, no. 18, 
p. 1318. 
(7) Schrenk, H. von. 
1903. On the production of wart-like intumescences produced by various 
fungicides. (Abstract.) In Science, n. s., v. 17, no. 424, p. 263. 
( 8 ) - 
1905. Intumescences formed as a result of chemical stimulation. In 16th 
Ann. Rpt., Mo. Bot. Gard., p. 125-148, pi. 25-31. Bibliography, p. 
146-148. 
(9) Schilling, E. 
1915. Uber hypertrophische und hyperplastische Gewebeswucherungen an 
Sprossachsen, verursacht durch Paraffine. In Jahrb. Wiss. Bot. 
[Pringsheim], Bd. 55, Heft. 2, p. 177-258, 43 fig. 
(10) Maassen, Albert. 
1904. Die teratologischen Wuchsformen (Involutionsformen) der Bakterien 
und ihre Bedeutung als diagnostisches Hilfsmittel. In Arb. K. 
Gsdhtsamt., Bd. 21, Heft. 3, p. 385-402, pi. 10-15. 
(11) Rumbold, Caroline. 
1916. Pathological anatomy of the injected trunks of chestnut trees. In 
Proc. Amer. Phil. Soc., v. 55, no. 6, p. 485-493, pi. 15-18. 
(12) Fischer, Bernhard. 
1906. Die experimentelle Erzeugung atypischer Epithelwucherungen und 
die Entstehungbosartiger Geschwiilste. In Miinch. Med. Wchnschr., 
Jahrg. 53, No. 42, p. 2041-2047, 8 fig. 
(13) Yamagiwa, K., and Ichikawa, K. 
1914. Ueber die atypische Epithelwucherung. In Gann. Japan. Ztschr. 
Krebsforsch., Bd. 7, Heft 2, p. 11-15. 
(14) Rosen, H. R. 
1916. The development of the Phylloxera vastatrix leaf gall. In Amer. 
Jour. Bot., v. 3, no. 7, p. 337-360, 5 fig., pi. 14-15* 
