vXOTJIRTSr- IR,, MICR. SOO. 1890, UPL. VII. 
Fig. a. 
C. Haughton Gill, Photo. 
Fig. 3- 
Fig. i. 
Fig. 4. 
Fig. 7. 
Fig. 6 
J. Maes, Phototyp. 
Diatoms charged 
with Mercurous 
By C. Haughton Gill. 
Sulphide, 
&c. 
