vi Contents. 
Some Field Evidence relating to the Modes of Occurrence of 
Intrusive Rocks, with some Remarks upon the Origin of 
Eruptive Rocks in general. By J. G. Goodchild, of the 
Geological Survey, F.G.S., F.Z.S., Curator of the Collection 
of Scottish Mineralogy in the Edinburgh Museum of Science 
and Art. Communicated by R. H. Traquair, LL.D., M.D., 
F.R.S. Issued separately May 20, 1904, 
Note on the Standard of Relative Viscosity, and on “Negative 
Viscosity.” By W. W. Taylor, M.A., D.Sc. Communicated by 
Professor Crum Brown. Issued separately June 16, 1904, 
The Viscosity of Aqueous Solutions of Chlorides, Bromides, and 
Iodides. By W. W. Taylor, M.A., D.Sc., and Clerk Ranken, 
B.Sc. Communicated by Professor Crum Brown. Issued 
separately June 16, 1904, ..... 
On the Date of the Upheaval which caused the 25 -feet Raised 
Beaches in Central Scotland. By Robert Munro, M.A., M.D., 
LL.D. Issued separately June 18, 1904, 
The Complete Solution of the Differential Equation of Jw. 
By the Rev. F. H. Jackson, H.M.S. “ Irresistible.” Com- 
municated by Dr Wm. Peddie. Issued separately August 15, 
1904, .... .... 
A Differentiating Machine. By J. Erskine Murray, D.Sc. 
Issued separately August 15, 1904, .... 
On the Thermal Expansion of Dilute Solutions of certain 
Hydroxides. By George A. Carse, M.A., B.Sc. Communicated 
by Professor MacGregor. Issued separately August 15, 1904, . 
Effect of Transverse Magnetization on the Resistance of Nickel at 
High Temperatures. By Professor C. G. Knott. Issued 
separately July 30, 1904, ..... 
Observations on some Aged Specimens of Sagartia troglodytes, and 
on the Duration of Life in Coelenterates. By J. H. Ashworth, 
D.Sc., Lecturer in Invertebrate Zoology in the University of 
Edinburgh, and Nelson Annandale, B.A., Deputy-Super- 
intendent of the Indian Museum, Calcutta. Communicated by 
Professor J. C. Ewart, M.D., F.R.S. Issued separately July 21, 
1904, ........ 
Note on the Molecular Condition of Nickel (and Iron) de- 
magnetised by decreasing Reversals. By James Russell. 
Issued separately August 22, 1904, .... 
On the Front and Rear of a Free Procession of Waves in Deep 
Water. ( Continued from Proc. R.S.E., Feb. 1st, 1904.) By 
Lord Kelvin. Issued separately August 22, 1904, 
Some Results in the Mathematical Theory of Seiches. By Pro- 
fessor Chrystal. Issued separately October 6, 1904, 
A New Form of Spectrophotometer. By J. R. Milne, B.Sc., 
Carnegie Scholar in Natural Philosophy, Edinburgh University. 
Issued separately November 5, 1904, .... 
A New Form of Juxtapositor to bring into Accurate Contact 
the Edges of the two Beams of Light used in Spectro- 
photometry, with an application to Polarimetry. By J. R. 
Milne, B.Sc., Carnegie Scholar in Natural Philosophy. Issued 
separately January 17, 1905, ..... 
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