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11 
Monday , 1 7 th January 1853. 
1 . On a simplification of the Instruments employed in Geographical 
Astronomy. By Professor C. Piazzi Smyth, . . .161 
2. On the Mechanical Action of Heat, Section YI. : — A review of 
the Fundamental Principles of the Mechanical Theory of 
Heat ; with remarks on the Thermic Phenomena of Currents 
of Elastic Fluids, as illustrating those Principles. By W. J. 
Macquorn Rankine, Esq., . .... 162 
Donations to the Library, . . . . 168 
Monday , 7 th February 1853. 
1. On the Structural Characters of Bocks. By Dr Fleming, . 169 
2. Observations on the Speculations of the late Dr Brown, and of 
other recent Metaphysicians, regarding the exercise of the 
Senses. By Dr Alison, . . . . 170 
Donations to the Library, . . . . . 172 
Monday , 21st February 1853. 
On the Summation of a Compound Series, and its application to a 
Problem in Probabilities. By the Bight Bev. Bishop Terrot, 173 
Monday , 7 th March 1853. 
1. On the Species of Fossil Diatomaceas found in the Infusorial 
Earth of Mull. By Professor Gregory, . . .176 
2. On the Production of Crystalline Structure in Crystallised 
Powders, by Compression and Traction. By Sir David Brew-' 
ster, K.H., D.C.L., F.B.S., V P.B.S. Edin., . . 178 
3. On the Structure and Economy of Tethea, and on an undescribed 
species from the Spitzbergen Seas. By Professor Goodsir, 181 
Donations to the Library, . . . . . 182 
Monday , 21st March 1853. 
On Circular Crystals. By Sir David Brewster, K.H<, D.C.L., 
F.B.S., V.P.B.S.E,, Associate of the Institute of France, 183 
Donations to the Library, , . . . T88 
For continuation of Contents see p. 3 of Cover. 
