VARIATION OF SALMONELLA PULLORUM 55 



Miiller, R. 1911. Mutationen bei Typhus and Ruhrbakterien (Mutationen 



als spezifisches Kulturmerkmal). Centralbl. Bakt. I Abt., Orig. 58:97-106. 

 Nageli, C. v. 1877. Untersuchungen iiber die niedere Pilze und ihrer Beziehung 



zu den Infektionskrankheiten und der Gesundheitspflege. (Cited by Hadley, 



P. Microbic dissociation. JoUr. Infect. Diseases 40:1-312, 1927.) 

 Nicolle, Ch. 1898. L'agglutination spontanee des cultures, ses rapports avec 



L'agglutination par les serums. Compt. Rend. Soc. Biol. [Paris] 50:1054-1055. 

 Peckham, A. W. 1907. The influence of environment upon the biological proc- 

 esses of the various members of the colon group of bacilli. Jour. Expt. Med. 



2:549-591. 

 Penfold, W. J. 1911. Studies in bacterial variation. (With special reference 



to the chemical functions of the members of the Typhoid-Coli group.) 



Jour. Hyg. [London] 11:30-67. 

 Penfold, W. J. 1912. On the specificity of bacterial mutation. (With a resume 



of the results of an examination of bacteria found in feces and urine, which 



undergo mutation when grown on lactose medium.) Jour. Hyg. [London] 



12:195-217. 

 Plastridge, W. N., and Rettger, L. F. 1930. An epidemic disease of domestic 



fowl caused by a hitherto undescribed organism of the Salmonella pullorum 



type. Jour. Infect. Diseases 47:334-339. 

 Plastridge, W. N., and Rettger, L. F. 1932. Variants of Salmonella pullorum. 



Jour. Infect. Diseases 50:146-161. 

 Plastridge, W. N., and Rettger, L. F. 1934. Virulence of Salmonella pullorum. 



Jour. Infect. Diseases 54:23-34. 

 Preisz, H. 1904. Studien iiber Morphologie und Biologie des Milzbrand- 



bacillus. Centralbl. Bakt. I Abt., Orig. 35:280-293. 

 Rettger, L. F. 1900. Septicemia among young chicks. N. Y. Med. Jour. 



71:803-805. 

 Rettger, L. F., and Harvey, S. C. 1908. Fatal septicemia in young chickens, 



or "White Diarrhea." Jour. Med. Research 18:277-290. 

 Rettger, L. F., and Sherrick, J. L. 1911. Studies on bacterial variation. Jour. 



Med. Research 24:265-284. 

 Rettger, L. F., and Plastridge, W. N. 1932. Pullorum disease of domestic fowl. 



Monograph. Conn. (Storrs) Agr. Expt. Sta. Bui. 178. 

 Rettger, L. F., and Gillespie, H. B. 1933. Bacterial variation, with special 



reference to pleomorphism and filtrability. Jour. Bact. 26:289-317. 

 Revis, C. 1912. The production of variation in the physiological activity of 



Bacillus coli by the use of malachite green. Roy. Soc. [London] Proc, Ser. B. 



85:192. 

 Roux, E. 1890. Bacteridie charbonneuse asporogene. Ann. Inst. Pasteur 



4:25-34. 

 Rowland, S. 1914. The influence of cultivation in serum containing media upon 



the virulence and immunizing properties of the plague bacillus. Jour. Hyg., 



Plague Supplement 3:403-411. 

 Savage, W. G. 1901. Pseudo-clumping in cultures of the typhoid bacillus. 



Jour. Path, and Bact. 7:388-399. 

 Savage, W. G., and White, P. B. 1925. An investigation of the Salmonella 



group, with special reference to food poisoning. Special Report Series No. 91, 



Med. Research Council (London). 

 Schiitze, H. 1921. The permanence of the serological paratyphoid B. types, 



with observations on the non-specificity of agglutination with "rough" 



variants. Jour. Hyg. [London] 20:330-341. 



