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 , 5th March 1855. 
On Annelid Tracks in the Exploration of the Millstone Grits 
in the South-west of the County of Clare. By Bobert 
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 Bottlera tinctoria. By 
Thomas Anderson, M.D., Begius Professor of Chemis- 
try in the University of Glasgow, . . .296 
Donations to the Library, .... 298 
Monday , \§th March 1855. 
Experiments on Colour as perceived by the Eye, with Be- 
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 James Smith, Esq., of Jordanhill, . . 301 
Monday , 2 d April 1855. 
Account of Experiments to ascertain the amount of Prof. 
Wm. Thomson’s “ Solar Befraction.” 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, ..... 303 
Besearches on the Amides of the Eatty Acids. By Thomas 
H. Bowney, Ph.D., Assistant to Dr Anderson. Com- 
municated by Dr Anderson, . . . 305 
