444 MICEO-OliGANISMS IN WATER 



BACTEEIUM LUTEUM (List) 



Authority.— List, Die Bakterien der Nittz- tmcl Trinkivdsser, Adametz. 

 Vienna, 1888. 



"Where Found. — In water. 



Microscopic Appearance. — Elliptical cells from 1-1 to 1-3 fi 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 WATER BACILLUS' 



Authority, — Adametz-Wichmann, Die Bakterien der Nuts:- mid Trink- 

 loasser, Vienna, 1888. 



Where Found. — In water. Also by Tils {Zeitschrift f. Hygiene, vol. ix., 

 p. 307) and by Tataroff {Die Dorpater Wasserbacterienf 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 HELYOLUS 



LIQUEFIES GELATINE 



Authority. — Zimmermann, Dk- Bakterien iinserer Trink- und Nutzwdsser, 

 inshesondere des Wassers der Ghemnitzer 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 fx broad and 

 1-5 to 2-5 fi and even 4-5 /x 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. 



Agae-agak. — Abundant growth, of a full Naples yellow colour. 



Potatoes. — Grows abundantly, forming a somewhat thick, shining, yellow 

 expansion, which sometimes assumes a greenish tint. 



