444 MICRO-ORGANISMS IN WATER 



BACTEBIUM LUTEUM (List) 



Authority. List, Die Baktericn dcr Nutz- und Trinkwasser, Adametz. 

 Vienna, 1888. 



Where Found. In water. 



Microscopic Appearance. Elliptical cells from 1-1 to 1-3 ft long. It is not 

 motile. 



Cultures. 



GELATINE PLATES. Forms irregular, slimy, orange yellow centres which 

 gradually form flat expansions. Under a low power they appear to consist of 

 club-shaped coarse granular zooglcea masses, each of which is made up of 

 several pieces. No liquefaction takes place. 



GELATINE TUBES. Forms an orange yellow expansion on the surface, but 

 grows slowly in the depth. 



MILK. Coagulates milk. 



Remarks. Grows at room temperature, but better at 30 C. 



'GOLDEN YELLOW WATEE BACILLUS' 



Authority. Adametz- Wichmann, Die Bakterien der Nutz- und Trink- 

 wasser, Vienna, 1888. 



Where Found. In water. Also by Tils (Zcitschrift f. Hygiene, vol. ix., 

 p. 307) and by Tataroff (Die Dorpatcr Wasserbacterien, Dorpat, 1891, p. 62). 



Microscopic Appearance. Bacilli, two or three times as long as broad. 

 Moves slowly. 



Cultures. 



GELATINE PLATES. The surface colonies are yellow shining dots, which 

 only develop slowly. Under a low power the depth colonies are seen to be oval 

 or circular, yellow and granular, whilst the surface colonies are round, with a 

 smooth rim, and yellow in colour. No liquefaction of the gelatine takes place. 



GELATINE TUBES. The surface growth is red, but in the depth along the 

 needle's track a shining yellow growth is seen. 



BACILLUS HELVOLUS 



LIQUEFIES GELATINE 



Authority. Zimmermann, l)i<- HaL-tcricn /insurer Trink- -nnd Nittzwasser, 

 insbesondere des \\'asscrs da- Cln-ntnitzcr Wasserleitung, Chemnitz, 1890. 



Where Found. In the Chemnitz water supply. 



Microscopic Appearance. Short bacilli which occur at first mostly in pairs 

 or in fours, but later form regular threads. They are about 0'5 /j. broad and 

 1-5 to 2-5 /J. and even 4-5 n long. Exhibit only rotatory movements. Spore forma- 

 tion has not been determined with certainty. 



Cultures. 



GELATINE PLATES. Forms in the depth small, circular, bright yellow dots, 

 and on the surface a distinctly raised, drop-shaped colony of a pale yellow 

 colour. The latter rests in a soft depression. Under a low power the depth 

 colonies are pale yellow or pale brown, circular, granular and smooth-rimmed. 

 The surface colonies are also for a time smooth-rimmed, but the periphery 

 becomes gradually more irregular. 



GELATINE TUBES. Forms a button-like growth on the surface, of a full 

 Naples yellow colour ; it becomes larger until it almost reaches the wall of the 

 tube, and the gelatine then assumes a saucer-like depression and becomes fluid. 

 There is but little growth in the depth, and the liquefaction only proceeds 

 slowly. 



AGAR-AGAR. Abundant growth, of a full Naples yellow colour. 



POTATOES. Grows abundantly, forming a somewhat thick, shining, yellow 

 expansion, which sometimes assumes a greenish tint. 



