On an Inaccuracy (having its greatest value about 1") in the 

 usual method of computing the Moon's Parallax. By 

 Edward Sang, Esq., . . . .292 



Monday, 6th March 1855. 



On Annelid Tracks in the Exploration of the Millstone Grits 

 in the South-west of the County of Clare. By Robert 

 Harkness, Esq., F.G.S., Professor of Geology, Queen's- 

 College, Cork, ..... 294 



On Superposition. By Professor Kelland, . . 296 



On the Colouring Matter of the Rottlera tinctoria. By 

 Thomas Anderson, M.D., Kegius Professor of Chemis- 

 try in the University of Glasgow, . . .296 



Donations to the Library, . . . .298 



Monday, l^th March 1855. 



Experiments on Colour as perceived by the Eye, with Re- 

 marks on Colour-Blindness. By James Clerk Max- 

 well, Esq., B.A., Trinity College, Cambridge. Com- 

 municated by Professor Gregory, . . .299 



Notice of the Occurrence of British newer Pliocene Shells 

 in the Arctic Seas, and of Tertiary Plants in Greenland. 

 In a letter from Dr Scoular of Dublin. Communicated 

 by Jamks Smith, Esq., of Jordanhill, . . 301 



Monday, 2d April 1855. 



Account of Experiments to ascertain the amount of Prof. 

 Wm. Thomson's " Solar Refraction." By Prof. C. 

 PiAzzi Smyth, ..... 302 



On the Extent to which the Theory of Vision requires us to 

 regard the Eye as a Camera Obscura. By Dr George 

 Wilson, ..... 308 



Researches on tlie Amides of the Fatty Acids. By Thomas 

 H. Rowney, Ph.D., Assistant to Dr Anderson. Com- 

 municated by Dr Anderson, . . , 305 



