S. a. Paine 493 



Pethybridge and Murphy (15) for their species B. melanogenes. It is thus 

 clear that in all these cases the same organism is being dealt with and in 

 agreement with the opinion of Morse the proper designation of the 

 organism is B. atrosepicus. Since several strains of this organism have 

 been isolated in different localities it is of interest to note that the one 

 found in Lancashire is the same as that previously found in Ireland. 



It is to be regretted that Morse was unable to obtain a virulent 

 culture of B. jjhytophthorus since it has been shown by Pethybridge 

 and Murphy (15) that this species differs only very shghtly from their 

 organism, and it seems probable that a comparison of this organism 

 along with the others studied by Morse would have proved it to be 

 identical with them. However, being unable to obtain a trustworthy 

 culture of B. phytophthorus, and in deference to the opinion of Smith(i8) 

 that this species is not identical with B. solanisaprus, Morse was forced 

 to exclude it from the species B. atrosepticus . Since the statement by 

 Smith was in all probability based upon physiological differences 

 which have been shown by Morse to be inconstant a comparison of the 

 cultural characters of B. phytophthorus and B. solanisaprus on the Hnes 

 laid down by Morse is highly desirable. 



SUIVBIARY. 



The organism which produces " Blackleg" of the potato in Lancashire 

 is B. atrosepticus (van Hall). 



It is in all respects identical with the organism responsible for this 

 disease in Ireland and described by Pethybridge and Murphy under 

 the name B. melanogenes. 



REFERENCES. 



1. Appel, O. Untersuchungen iil)er die Schwarzbeinigkeit und die durch Bak- 



terien hervorgerufene Knolleiifaule der Kartoffel. Arb. a. d. hiol. Anst. /. 

 Land- u. Forshvirthschaft, Bd. m, s. 364, 1903. 



2. Delacroix, G. Sur une maladie bacterienne de la pomme de terre. Comp. 



rend., cxxxni, p. 417, 1901. 



3. Frank, A. B. Die Bakterienlcrankheiten der Kartoffeln. Centralhl. f. Bakt. 



Abt. II, Bd. V, s. 98 u. 134, 1899. 



4. Griffon, Ed. Sur le role des bacilles fluoresceiits de Fliigge en Pathologie 



vegetale. Comp. rend., cxlix, p. 50, 1909. 



5. VAN Hall, C. J. J. Bijdragen tot de Kennis der bakterieelle Plantenziekten. 



Dissertation. Amsterdam, 1902. 



6. Harrison, F. C. A Bacterial Rot of the Potato caused by Bacillus solani- 



saprus. Centralhl. f. Bakt. Abt. ii, Bd. xvn, s. 34, 1907. 



