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On the Formation of Coal, and on the Changes produced in 
the Composition of the Strata by the Solvent Action of 
Water slowly percolating through the Earth’s Crust 
during long periods of Geological Time. By R. W. 
Thomson, C.E., F.R.S.E., . . . .68 
Note on Homocheiral and Heterocheiral Similarity. By 
Sir William Thomson, . . . .• . . 70 
Monday , 3 d March 1873. 
On the Mud Banks of Narrakal and Allippey, two Natural 
Harbours of Refuge on the Malabar Coast. By George 
Robertson, Esq., C.E., . . . .70 
The Meteorology of the Month of May. By Alexander 
Buchan, M.A., * . . . .79 
On Vortex Motion. By Sir William Thomson; . . .80 
Monday , 11th March 1873. 
A Contribution to the Visceral Anatomy of the Greenland 
Shark ( Lcemargus borealis). By Professor Turner, . 81 
Additional Note on the Strain-Function, &c. -By Professor 
Taut, ...... 84 
Monday , 1th April 1873. 
Notice of a Singular Properly exhibited by the Fluid en- 
closed in Crystal Cavities. By Edward Sang, Esq., . 87 
On the Germ Theory of Putrefaction and other Fermenta- 
tive Changes. By Professor Lister, . . . 89 
Monday , 21 st April 1873. 
Notice of New Fishes from West Africa : — (I.) Ophioceph- 
alus obscurus, Gunther. (II.) Synodontis Bobbianus , 
nov. spec, milii. (With a Plate). By John Alex- 
ander Smith, M.D., . . . . .89 
On the Electrical Conductivity of Certain Saline Solutions, 
with a note on their Density. By J. A. Ewing and J. 
G. MacGregor, B.A. Communicated by Professor 
Tait, ....... 95 
On the Effect of Heating one Pole of a Magnet, the other 
being kept at a Constant Temperature. By D. H. Mar- 
shall, Esq., M.A., and C. G. Knott, Esq. Communi- 
cated by Professor Tait. (With a Plate), . . 97 
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