/[tk Series, Vol III. 



Plate VIII. 



LENTICULAR ABSORPTION CELL (X ioj, 

 for small quantities of Opaque Fluids (Blood, &>c). 



FIC 1 



CONICAL ABSORPTION CELL (X ioj, 

 for large quantities of Transparent Fluids (Chlorophyll, &>c.) 



MEMOIRS AND PROCEEDINGS, MANCHESTER LIT. AND PHIL. SOC. 



