52 
CONTENTS. 
PAGE 
Chairman’s Opening Address, Session 1899-1900. By Lord 
Kelvin, P.R.S.E., 2 
On Swan’s Prism Photometer, commonly called Lummer and 
Brodhun’s Photometer. By Professor C. G. Knott, D.Sc., . 12 
On the Thermo-electric Properties of Solid and Liquid Mercury. 
By Dr W. Peddie and A. B. Shand, Esq., . . .15 
The Torsional Constants of Iron and Steel. By Dr W. Peddie, . 16 
On the Claim recently made for Gauss to the Invention (not the 
Discovery ) of Quaternions. By Professor Tait, . . .17 
Professor Klein’s View of Quaternions ; a Criticism. By Professor 
C. G. Knott, . . . . .24 
The Examination of Sea-Water by an Optical Method. By J. J. 
Manley, Magdalen College Laboratory, Oxford. Communicated 
by Sir John Murray, K.C.B., . . . . .35 
Further Investigations on the Life-History of the Salmon in Fresh 
Water. By D. Noel Paton, M.D., F.R.C.P.Ed., and M. I. 
Newbigin, D.Sc., . . . . . . . 44 
On the Rectal Gland of the Elasmobranchs. By J. Crawford, 
M.B., C.M. Communicated by Dr Noel Paton. (With a Plate), 55 
A New Form of Myograph and its Uses. By S. C. Mahalanobis, 
B.Sc., F.R.M.S., F.R.S.E., Assistant Lecturer on Physiology, 
University College, Cardiff, . . . . .62 
The Presence of Enzymes in Normal and Pathological Tissues. By 
John Souttar M ‘Kendrick, M.D., . . . 68 
On the Law of Elastic Fatigue. (Abstract.) By Dr W. Peddie, . 90 
Observations on some Nemerteans from Singapore. By R. C, 
Punnett, B.A. Communicated by Dr A. T. Masterman, . 91 
The Theory of Alternants in the Historical Order of its Develop- 
ment up to 1841. By Thomas Muir, LL.D., . . .93 
On Jacobi’s Expansion for the Difference-Product when the 
Number of Elements is even. By Thomas Muir, LL.D., . 133 
On certain Aggregates of Determinant Minors. By Thomas 
Muir, LL.D., ....... 142 
Note on the Activity of the Saliva in Diseased Conditions of the 
Body. By W. G. Aitchison Robertson, M.D., D.Sc., F.R.C.P.E., 155 
