6 SULPHUR BACTERIA 



for the white patches in rivers are almost certainly the result 

 of the multiplication of those species designated somewhat 

 loosely as sewage-fungi ; and the blood-red water could not 

 have been tinted by the sulphur bacteria, for these are found 

 only in shallow waters. 



The observations on coloured sulphur bacteria are numer- 

 ous. The following recorders among others may be noted : — 



{a) Egypt, Arabia, Siberia. — Ehrenberg, Chr. G. (1830) ; 

 Hirsch, B. (1874). 



[b) Germany. — Ehrenberg, Chr. G. (1830) ; Corda, A. J. C. 

 (1835) ; Cohn, F. (1875) ; Zopf, W. (1882) ; Engler, A. (1882) ; 

 Winogradsky, S. (1887) ; Zacharias, O. (1903) ; Kolkwitz, R. 

 (1914) ; Duggeli, M. (1917) ; Buder, J. (1919) ; Gicklhorn, J. 

 (1921). 



(c) Great Britain. — Lankester, Ray (1873) ; Klein, E. 

 (1875); Ewart, A. J. (1897); Skene, Macgregor (1914) ; Ellis, 

 D. (1924-30) 



(d) France.- — Fontan, A., and Joly, N. (1844) ; Gerardin 



(1873). 



[e) Russia.- — Weisse, J. F. (1845) ; Winogradsky, S. (1884) ; 

 Jegunow, M. (1898) ; Nadson, G. A. (1903) ; Omclianski, W. 

 (1904) ; Arzichowsky, W. (1902) ; Elenkin, A. A. (1914) ; 

 Issatchenko, B. L. (1913-14). 



(/) Italy. — Trevisan, V. (1842) ; Hinze, G. (l 914- 1 5). 



(g) Denmark. — Warming, E. (1875). 



(h) yapan.—Miyoshi, M. (1897). 



[i] Holland. — Beijerinck, M. W. (1904). 



(7) Ceylon. — Crow, W. B. (1923). 



(k) United States of America. — Waksman, S. A. (1922) ; 

 Baas-Becking, L. G. M. (1924). 



[l] Sweden. — Gertz, 0., and Naumann, E. (191 6). 



(m) Poland. — Szafer, W. (1910) ; vStrzeszcwski, B. (191 3). 



[n) Pyrenees. — Joly, N. (1882). 

 It will be evident from this list that the countries represented 

 in it are those that contain investigators, and that absence 

 of representation is due to the lack of investigators, not to 

 the absence of the sulphur bacteria. 



Strzeszevvski (i) has made a study of the plant associations 



