Report on the Bacteriology of Water. 



137 



Powerfully re- 

 duces the ni- 

 trate to ni- 

 trite. 



Reduces a very 

 small propor- 

 tion of the 

 nitrate to ni- 

 trite. 



Powerfully re- 

 duces the ni- 

 trate to ni- 

 trite. 



Reduces the ni- 

 trate to ni- 

 trite only very 

 slightly. 



Produces a 

 thick irregu- 

 lar flesh colo- 

 ured pigment. 



Produces a de- 

 licate and 

 slightly yellow 

 growth which 

 is barely visi- 

 ble. 



Produces a dry 

 and uniform 

 expansion, 

 which is al- 

 most quite 

 white. 



Produces a thick 

 and magnific- 

 ently brilliant 

 red - orange 

 pigment which 

 is however re- 

 stricted to the 

 point ox inocu- 

 lation. 



The liquid re- 

 mains clear, 

 whilst a con- 

 siderable white 

 flocculent de- 

 posit is form- 

 ed. 



Renders it tur- 

 bid and pro- 

 duces a dirty 

 white deposit, 

 whilst the sur- 

 face becomes 

 covered with a 

 thin pellicle. 



Forms a light 

 flocculent de- 

 posit, and pro- 

 duces later a 

 tough and 

 wrinkled pel- 

 licle on the 

 surface. 



The liquid re- 

 mains clear, 

 whilst a slight- 

 ly orange 

 coloured de- 

 posit is pro- 

 duced. A thin 

 pellicle forms 

 on the sur- 

 face, which 

 exhibits here 

 and there 

 bright spots of 

 orange colour. 



Produces a 

 smooth shin- 

 ing grayish 

 pigment. 



Produces a thin 

 •opalescent 

 blue-violet ex- 

 pansion, the 

 edges of which 

 exhibit later a 

 distinct violet 

 fluorescence. 



Grows rapidly 

 over the whole 

 surface, whilst 

 in the depth 

 the character- 

 istic "branch- 

 ing" is again 

 visible. 



Forms a bright 

 orange expan- 

 sion, which 

 does not ex- 

 tend much 

 beyond the 

 point of in- 

 oculation. 



Forms a moist shining 

 grey expansion, whilst 

 in the depth the path 

 of the needle is indi- 

 cated by a slight sword- 

 like growth. Slow li- 

 quefaction of the gela- 

 tine takes place. 



The surface is liquefied, 

 bnt all along the path 

 of the needle a series 

 of horizontal circular 

 plates arise, having a 

 delicate cloud-like ap- 

 pearance. Later the 

 whole of the gelatine 

 becomes liquid. 



The whole contents of 

 the tube become im- 

 pregnated with fluffy 

 ramifications. Later 

 liquefaction takes 

 place, and a tough 

 pellicle forms on the 

 surface. 



A shining orange 

 coloured expansion 

 forms on the surface, 

 whilst hardly any 

 growth is visible in 

 the depth. 



The colonies in the depth 

 are irregular in contour, j 

 This irregularity increases 

 as the liquefaction com- 

 mences, and the colony ap- 

 proaches the surface. The 

 periphery is seen to consist 

 of closely packed wavy 

 bands of bacilli, whilst the 

 centre of the colony looks 

 irregular and wrinkled. 



Forms cloudy undefined 

 patches, which under the 

 microscope are seen to con- 

 sist of a thick and tangled 

 mass of bacillar threads. 

 Rapid liquefaction of the 

 gelatine takes place. 



The colonies are seen to 

 consist of cloudy centres 

 with tangled root - like 

 branches extending in 

 every direction. Later 

 liquefaction of th« gela- 

 tine takes place. 



Produces bright orange pin- 

 heads. Under the micro- 

 scope the depth colonies 

 are seen to be smuoth- 

 rimmed. No liquefaction 

 of the gelatine takes place, 

 and its growth is slow. 



Large bacillus with 

 rounded ends, in length 

 about 2 to to 3 fi, and 

 about 1 fi broad. 

 Forms extensive ver- 

 miform threads. Pro- 

 duces oval spores about 

 1-5 fx long, and 1 /a 

 broad. It is not motile. 



Slender bacillus, about 

 3 ju. long and 0-3 fi 

 broad. Forms long 

 wavy threads in broth 

 cultures. No spores 

 were found. The iso- 

 lated bacilli exhibit 

 violent rotatory move- 

 ments, but the threads 

 are quite stationary. 



Much resembles B. sub- 

 lilis. The individual 

 bacilli are about 7 /u, 

 long and 1"7 ju. broad, 

 the ends being dis- 

 tinctly rounded. It 

 gives rise to long 

 threads, also spores. 

 Is capable of only 

 slight oscillatory move- 

 ment. 



Short fat bacillus of 

 very variable dimen- 

 sions. It grows in 

 pairs, and also forms 

 long threads. The 

 short bacilli are about 

 1-7 iu long, and nearly 

 half as wide as long. 

 No spores were ob- 

 served. The individual 

 bacilli ara motile. 



No. 4.— Bacillus ' 

 vermicularis. 

 Uiver Lee. 



No. 5. — Bacillus 

 nubilus. 

 River Thames. 



No. 6. — Bacillus 

 ramosus. 

 Frequently found in 

 Rivers Thames and 

 Lee, but never in 

 deep- well water. 



No. 7. — Bacillus 

 aurantiacus. 

 Deep-well water. 



