Ill 
Thallic Sulphates and Double Sulphates. By Hugh Marshall, D.Sc. 
Issued separately August 30, 1902, ..... 
On Superposed Magnetic Inductions in Iron. By James Russell. 
{Abstract.) Issued separately October 7, 1902, 
On the Use of Quaternions in the Theory of Screws. By Dr W. Peddie. 
Issued separately October 7, 1902, ..... 
Contributions to Scottish Mineralogy. (Part I.) By J. G. Gooclcliild, of 
the Geological Survey, F.G.S., F.Z.S. Communicated by F. Grant 
Ogilvie. Issued separately November 15, 1902, 
On Causes which determine the Formation of Amorphous Sulphur. By 
Professor Alexander Smith, B.Sc., Ph.D. Issued separately November 
15.1902.. ........ 
Quaternion Notes. By the late Professor Tait. Communicated by 
Professor C. G. Knott. (With a Plate.) Issued separately January 
17.1903.. . . . . . . 
The Electric Conductivities and Relative Densities of certain Samples of 
Sea-Water. By J. J. Manley, Daubeny Curator, Magdalen College, 
Oxford. Communicated by Sir John Murray, K.C.B. Issued separately 
January 24, 1903, . 
Freezing-Point Depression in Electrolytic Solutions. By James Walker, 
F.R.S., and A. J. Robertson, B.Sc., University College, Dundee. 
• Issued sepai ately January 28, 1903, . 
Note on Pure Periodic Continued Fractions. By Thomas Muir, LL.D. 
Issued separately February 28, 1903, . . . . . 
The Generating Functions of certain Special Determinants. By Thomas 
Muir, LL.D. Issued separately February 28, 1903, 
Some Observations on Cyanosis. By G. A. Gibson, M.D., D.Sc., F.R.C.P. 
Edin., Physician to the Royal Infirmary, Edinburgh. Issued separ- 
ately April 4, 1903, ....... 
On the Isoclinal Lines of a Differential Equation of the First Order. 
By J. H. Maclagan-Wedderburn. Communicated by Professor Chrystal. 
Issued separately April 4, 1903, ...... 
On the General Scalar Function of a Vector. By J. H. Maclagan- 
Wedderburn. Communicated by Dr W. Peddie. Issued separately 
June 5, 1903, ........ 
On the Equation of a Pair of Tangents to a Conic. By Professor A. H. 
Anglin, Queen’s College, Cork. (Abstract.) Issued separately June 5, 
1903, 
Suggestion as to the Cause of the Earth’s Internal Heat. By George 
Romanes, C.E. With Notes by Professors A. Gray and C. G. Knott. 
Communicated by Dr C. G. Knott. (With a Plate.) Issued separately 
June 5, 1903, ........ 
The Occurrence of the Sperm Whale or Cachalot in the Shetland Seas, 
with Notes on the Tympano-petrous Bones of Physeter, Kogia, and 
other Odontoceti. By Sir William Turner, K.C.B., F.R.S. Issued 
separately June 5, 1903, ....... 
Some Observations on the Young Scales of the Cod, Haddock and 
Whiting before Shedding. By Mr Alex. Wallace Brown, St Andrews. 
Communicated by Dr A. T. Masterman. Issued separately August 3, 
1903, ......... 
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