Contents. 
Vll 
PAGE 
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. Good- 
child, 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 separately 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 separately 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, . . . . 
On the Series — 
Issued separately August 3, 1903, . 
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