vi CONTENTS. 
On Sun Spots, and their connection with Planetary Configura- 
tions. By Balfour Stewart, Esq. Coramunicated by Professor 
Tait, ........ 213 
Biographical Sketch of Adam Ferguson, LL.D., F.R.S.E., Pro- 
fessor of Moral Philosophy in the University of Edinburgh. By 
John Small, Esq., M.A., Librarian to the Universitj'" of Edin- 
burgh. Communicated by Professor Fraser, . . .214: 
Unpublished Letter of the late Professor Dugald Stewart. Trans- 
mitted by John Small, M.A., Librarian to the University. Com- 
municated by the Rev, Dr Stevenson, . . . .215 
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.SS. Lond. and Edin., . . . .224: 
On the Variations of the Fertility and Fecundity of Women accord- 
ing to Age. B}^ Dr J. Matthews Duncan, . . . 225 
On the Chemical and Physical Principles in connection with the 
Specific Gravity of Liquid and Solid Substances. 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 College, Cambridge, and Fel- 
low of the Cambridge Philosophical Society. Communicated by 
Professor Tait, ...... 232 
Preliminary Note on the Connection between the Form and Optical 
Properties of Crj^stals. 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. 
Liineburg, ....... 258 
Opening Address, Session 1864-65. By His Grace the Duke of 
Argyll, ....... 264 
Address, as President. By Sir David Brewster, K.H., F.R.S., . 321 
On Variability in Human Structure, with illustrations from the 
Flexor Muscles of the Fingers and Toes. By William Turner, 
M.B. (Lond.), Demonstrator of Anatomy in the University, Edin., 327 
On the Principle of Onomatopoeia in Language. By Professor 
Blackie, ....... 327 
Note on the Phlogistic Theory. By Alexander Crum Brown, 
M.D., &c. . . . . . . .328 
A Map of Taranaki, New Zealand, executed by a Maori, ex- 
hibited, and remarks on it by Dr Lauder Lindsay were com- 
municated by Mr A. Keith Johnston, .... 335 
Note on the Various Investigations of the Law of Frequency of 
Error. By Professor Tait, ..... 335 
