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Monday^ 2lst March 1864. 
On the Anatomy and Physiology of the Mitral, Tricuspid, 
and Semilunar Valves in Mammals, Birds, Reptiles, 
and Fishes. By James B. Pettigrew, M.D., Edin- 
burgh ; Assistant in the Museum of the Royal Col- 
lege of Surgeons of England. Communicated by Wm. 
Turner, M.B., ..... 193 
On some points in the Metrology of the Great Pyramid. 
By Professor C. Piazzi Smyth, Astronomer Royal for 
Scotland, .* . . . .198 
The Decimal Problem Solved. By James Alexander, 
Esq. Communicated by E. Sang, Esq., . . 199 
On the Elevation of the Earth’s Surface Temperature pro- 
duced by Underground Heat. By Professor W. 
Thomson, F.R.S., F.R.S.E., , . . 200 
Donations to the Library, . . . . 201 
Monday, ^ih April 1864. 
On the Celtic Languages in their Relation to each other, 
and to the Teutonic Dialects. By W. F. Skene, Esq., 202 
On the Protection of Vegetation from Destructive Cold 
every night. By Professor W. Thomson, . 203 
Donations to the Library, .... 205 
Monday, 18^7i April 1864. ' 
On Vital Agency with reference to the Correlation of 
Forces. By William Seller, M.D., F.R.S.E., Fellow 
of the Royal College of Physicians of Edinburgh, . 209 
On Sun Spots, and their connection with Planetary Con- 
figurations. By Balfour Stewart, Esq. Commu- 
nicated by Professor Tait, . . . 213 
Biographical Sketch of Adam Fergusson, LL.D., F.R.S.E., 
Professor of Moral Philosophy in the University of 
Edinburgh. By John Small, Esq., M.A., Librarian 
to the University of Edinburgh. Communicated by 
Professor Fraser, . . . .214 
Donations to the Library, . . . , 214 
