IV 
Contents. 
On the Anatomy of a new Species of Polyodon, the Polyodon G-ladius 
of Martens, taken from the river Yang-tsze-Kiang, 450 miles above 
Woosung. Part I., being its External Characters and Structure. 
By P. D. Handyside, M.D., ..... 
Note on the Thermal Equivalents of the Oxide of Chlorine. By 
James Dewar, Esq., ....... 
On the Resemblances which Microscopic Objects in Dichroite and 
Amethyst have to some of the lower forms of Organic Life. By J. 
Scott, Tain. Communicated by Professor Kelland, 
Note on the Zodiacal Light. By George Forbes, Esq., 
Note on Angstrom’s Method for the Conductivity of Bars. By Pro- 
fessor Tait, ........ 
On the Thermal Conductivity of Ice, and a new Method of Deter- 
mining the Conductivity of Different Substances. By Professor 
George Forbes, ....... 
On the Formation of Coal, and on the Changes produced in the Com- 
position of the Strata by the Solvent Action of Water slowly per- 
colating through the Earth’s Crust during long periods of Geological 
Time. By R. W. Thomson, C.E., F.R.S.E., 
Note on Homocheiral and Heterocheiral Similarity. By Sir William 
Thomson, . . . . . . . 
On the Mud Banks of Narrakal and Allippey, two Natural Harbours 
of Refuge on the Malabar Coast. By George Robertson, Esq., C.E., 
The Meteorology of the Month of May. By Alexander Buchan, M. A., 
On Vortex Motion. By Sir William Thomson, 
A Contribution to the yisceral Anatomy of the Greenland Shark 
(Lcemargus borealis). By Professor Turner, 
Additional Note on the Strain-Function, &c. By Professor Tait, 
Notice of a Singular Property exhibited by the Fluid enclosed in 
Crystal Cavities. By Edward Sang, Esq., .... 
On the Germ Theory of Putrefaction and other Fermentative Changes. 
By Professor Lister, ...... 
Notice of New Fishes from West Africa — 
I. Ophiocephalus obscurus, Gunther, .... 
XI. Synodontis Bobbianus, nov. spec. mihi. (With a Plate). 
By John Alexander Smith, M.D., 
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, ..... 
On the Effect of Heating one Pole of a Magnet, the other being kept 
at a Constant Temperature. By D. H. Marshall, Esq., M.A., and 
C. G. Knott, Esq. Communicated by Professor Tait. (With a 
Plate), . 
On the Physiological Action of Light. No. I. By James Dewar, 
Esq., and John G. M‘Kendrick, M.D., of the University of Edin- 
burgh, . 
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