— 72 — 



All sugar tests have been clone in quaclruplicale, and all other cultures made 

 in duplicate, and in many cases in quadruplicate. 



(Note. — Other plants were inoculated and some reacted. A list of these 

 plants as well as technical details regarding the morphological characters of the 

 organism and the preparation of culture media will be found in the Transactions 

 of the Royal Society of Canada, 1913). 



REFERENCES. 



1. Jones, L. R. Bacillus carotovorus n. sp.. Die Ursache einer weichen 

 Faulnis der Mohre. Centbl. Bakt. u. Par., II, 7; 12-21 ; 61-68, 1901. Also, Jones, 

 L. R. A soft rot of carrot and other vegetables. Ann. Rep. Vt Agr. Exipt. Station 

 13: 299-332, 1901. 



2. Potter, M. C. Ueber eine Bakterienkrankheit der Ruben {Brassica Na- 

 p7is). Centbl. Bakt. u. Par., 11. 7; 282-288; 353-362, 1901. 



3. Spieckermann, A., Beitrag zur Kenntniss der bakteriellen Wundfaulnis 

 der Kulturpflanzen. Landiu. Jahrh., 31: 155-178, 1902. 



4. Townsend, C. O. A soft rot of the calla lily. U. S. Dept. of Agriculture, 

 B. P. I., Bui. 60, 1904. 



5. Harrison, F. C. A Bacterial Disease of Cauliflower (Brassica oleracea) 

 and allied plants. Cent. f. Bakt. II Abte. 13, p. 46 and 185. 



6. van Hull, C. J. J. Das Faulen der jungen Schosslinge und Rhizome von 

 Iris florentina und Iris germanica, verussacht durch Bacillus omnivorus v. Hall 

 und durch eipige andere Bakterienarten. Ztschr. Pflanzcnkr., 13: 129-144, 1903. 



7. Harding, H. A., and Morse, W. J. The Bacterial Soft Rots of certain 

 vegetables. Tech. Bull, No. 11, Geneva, N. Y., 1909. 



8. Harding, H. A. and Stewart, F. C. A bacterial soft rot of certain cruci- 

 ferous plants and Amorphophiilhis simlcnse. Science, N. S., 16: 314-315, 1902. 



9. Saccardo, P. H. Chromotaxia sen nomenclator colorum. Patavii, 1894. 



INJURY AND ABSCISSION IN IMPATIENS SULTANI 



By Francis E. Lloyd, AIcGill Univ., Montreal. 



It is a well-known fact that the injury to developing fruits by insects is follow- 

 ed by shedding, and the same is true of flower buds. Perhaps the most notable ex- 

 ample, historically considered, is the shedding of cotton flower-buds and bolls as 

 the result of the punctures made by the boll-weevil (Anthonomus grandis), this 

 because of the dramatic progress of the insect across a wide territory year by year, 

 moving, like a tidal wave, inexorably and unhinderably. Other examples, how- 

 ever, are numerous enough, and will be called to mind by everyone familiar with 

 the crops of fruit-garden and orchard. 



Obvious, however, as this fact is, it is by no means a simple physiological 

 problem. Even the amount, position and kind of injury necessary to procure a 

 definite response are not yet known, quite apart from the events in the sequence 

 of changes initiated by the mechanical act of injury, though in the case of pears 

 and of allied fruits probably, injury is followed by the rapid formation of tannic 

 acid in the injured parts (Cook et al). There has, nevertheless, been some attempt 

 at determining the amount and kind of injury required to induce abscission in a 



