MEMOIRS 



OP THE 



MANCHESTEE 



LITEKARY AND PHILOSOPHICAL SOCIETY 



I. On the Mean Intensity of Light that has passed through 

 Absorbing Media. By James Bottomley, D.Sc., F.C.S. 



Bead October 4th, 1881. 



In colorimetric experiments the areas compared are 

 assumed to be of the same tint throughout. When, 

 however, we look through columns of coloured liquid at 

 external white surfaces, this condition will not be exactly 

 fulfilled. 



Suppose the bottom of the containing cylinder to be 

 perfectly flat. Owing to the adhesion of the liquid to 

 the sides, and the consequent elevation there above the 

 general level, the colour will be more intense near the 

 sides. This, however, if the cylinders are of moderate 



SEK. III. VOL. VIII. B 



