CONTENTS. 



ARTICLE PAGE 



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



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



II, — Correction of the Formula used in Photometry for Absorp* 

 tion when the medium is not perfectly transparent. By 

 James Bottomley, D.Sc, F.C.S ..,...,.. 5 



III.— On the Failure of certain Mathematical Solutions of the 

 Problem of the Motion of a Solid through a Perfect Fluid. 

 By R. F. G-wyther, M.A , >, ,. 7 



IV.— On the Manufacture of Salt in Cheshire, By Thomas 

 ^ Ward, Esq , 9 



V, — Remarks on the Terms used to denote Colour, and on the 

 Colours of Faded Leaves. By Edward Schunck, Ph.D., 

 F.R.S =, 26 



VI. — On Differential Resolvents and Partial Differential Re- 

 solvents. By Robert RaWson, Esq., Assoc. I.N. A., Hon. 

 Member of the Society k 41 



VII. — An Analysis of the recorded Diurnal Ranges of Magnetic 

 Declination, with the view of ascertaining if these are 

 composed of Inequalities which exhibit a true Periodicity, 

 By Balfour Stewart, M.A., LL.D., F.R.S., Professor of 

 Natural Philosophy at the Owens College, and William 

 Dodqson, Esq 54 



VIII.— Colorimetry.— Part VI. By James Bottomley, B.A., D.Sc, 70 



