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Monday^ 2d May 1864. 
Unpublished Letter of the late Professor Dugald Stewart. 
Transmitted by John Small, M.A., Librarian to the 
University. Communicated by the Rev, Dr Steven- 
son, ...... ^15 
The Law of Aeriform Volumes extended to Dense Bodies. 
By J. G. Macvicar, A;M., D.D. Communicated by 
Professor Lyon Playfair, . . . 220 
On the Freezing of the Egg of the Common Fowl. By 
John Davy, M.D., F.R.S. Lond. and Ed. . . 224 
On the Variations of the Fertility and Fecundity of Women 
according to Age. By Dr J. Matthews Duncan, 225 
On the Chemical and Physical Principles in connection 
with the Specific Gravity of Liquid and Solid Sub- 
stances. By Otto Richter, Ph.D. Communicated 
by Professor Maclagan, . . . .226 
On the Theory of Isomeric Compounds. By Dr A. Crum 
Brown, . , . . . . 230 
On the Rhombohedral System in Crystallography. By 
Alfred R. Catton, B.A., Scholar of St John’s Col- 
lege, Cambridge, and Fellow of the Cambridge Philo- 
sophical Society. Communicated by Professor T ait, 232 
Preliminary Note on the Connection between the Form 
and Optical Properties of Crystals. By Alfred R. 
Catton, B. A., F.C.P.S., Scholar of St John s College, 
Cambridge, ..... 242 
A Contribution to the History of the Oxides of Manganese. 
By W. Dittmar, Esq., . . . . 255 
Notice of Glacial Clay, with Arctic Shells, near Errol, on 
the Tay. By the Rev. Thomas Brown, F.R.S.E., 257 
Notes on the Boulder-Clay at Greenock and Port-Glasgow. 
By the Rev. R. Boog Watson, B.A., F.R.S.E., Hon. 
Mem. Nat. Ver. Luneburg, . . . 258 
Donations to the Library, . ,. . . 261 
