PLATE Vill Royal Soc. Trans Kdin Vol. XX1. 
M® Swan's observations of the Carbohydrogen Spectrum. Fifa 
¥ bbb i 
M® PONTONS PHOTOMETER. | 
FIG 4 size. FIG.2 4 size 
x 
L£IG. 5 
W.S AK. Johnston, Edinburgh. 
