924 ON THE EXAMINATION OF WATER FROM THE SYDNEY SUPPLY. 



EXPLANATION OF PLATES. 



Plate X. 



Fig. 1. — Bacterial colonies growing in a gelatine plate-cultivation, out of 

 1 ccm. of pipe-water (July 19, 1886), after two days' incubation 

 at about 65° F. (18£° C.) Natural size. (The layer of gelatine 

 is represented here as in the following figures by a brownish 

 tint). 



a. Liquefying colonies of Bacillus A. (p. 915). 



b. Non-liquefying colonies of Bacillus B. (p. 917). 



Fig. 2.— Liquefying colonies (c) of Bacillus C. (p. 919), after several days. 

 Natural size. The other colonies which were at the same time 

 found on the plate are omitted (July 29th, 1886). 



Plate XL 



Fig. 3. — Bacterial colonies from \ ccm. of water (Aug. 17th, 1886), after 

 several days' incubation. Natural size. 



a. Colonies of Bacillus A. (p. 915). 



b. Interior ) 



h S fi " 1 i Colonies, non-liquefying, of Bacillus B. (p. 917). 



Fig. 4. — Colonies from £ ccm. of water (Aug. 23rd, 1886), after some days. 

 Natural size. 



a. Bacillus A. 



b. b,. Bacillus B. 



c. Bacillus C. 



d. Liquefying colonies of Bacillus D. 



