VI 
CONTENTS. 
On the Fall of Rain at Carlisle and the neighbourhood. By Thomas 
Barnes, M.D., ....... 434 
Mathematical Notes. By Professor Tait— 
1. On a Quaternion Integration, .... 434 
2. On the Ovals of Descartes, ..... 436 
On the Remarkable Annelida of the Channel Islands, &c. By W. C. 
MTntosh, M.D., ....... 438 
Note. On the Use of the Scholastic Terms Vetus Logica and Nova 
Logica, with a Remark upon the corresponding Terms Antiqui 
and Moderni. By Thomas M. Lindsay, M.A., Examiner in Phi¬ 
losophy to the University of Edinburgh, . . . .441 
On some Abnormal Cones of Pinus Pinaster. By Professor Alex¬ 
ander Dickson, ....... 449 
Address on Spectrum Analysis. By Professor Tait, . . . 455 
Note on the Early History of Spectrum Analysis. By H. Fox Talbot, 
Hon. F.R.S.E., . . . . . . .461 
On some Optical Experiments. By H. F. Talbot, Hon. F.R.S.E.— 
1. On a New Mode of observing certain Spectra, . .466 
2. On the Nicol Prism, ...... 468 
Note on a New Scottish Acidulous Chalybeate Mineral Water. By 
James Dewar, F.R.S.E., ...... 470 
On the Homologies of the Vertebral Skeleton in the Osseous Fishes 
and in Man. By Professor Macdonald, . . . .472 
Scheme for the Conservation of Remarkable Boulders in Scotland, 
and for the Indication of their Positions on Maps. By D. Milne 
Home, Esq., ....... 475 
Note of a New Form of Armature and Break for a Magneto-Electric 
Machine. By R. M. Ferguson, Ph.D., .... 488 
Mathematical Notes. By Professor Tait— 
1. On a Property of Self-Conjugate Linear and Vector Func¬ 
tions, ....... 498 
2. Relation between corresponding Ordinates of two Parabolas, . 499 
3. On some Quaternion Transformations, . . . 501 
4. On an Expression for the Potential of a Surface-distribu¬ 
tion, &c., ... ... 503 
An Experimental Research on the Antagonism between the Actions 
of Physostigma and Atropia. By Dr Thomas R. Fraser. (With a 
Diagram), ........ 506 
On the Homological Relations of the Coelenterata. By Professor 
Allman, F.R.S.E., ....... 512 
Donations to the Society, ...... 514 
Opening Address, Session 1871-72. By Sir Robert Christison, Bart. 531 
On the Computation of the Strengths of the Parts of Skeleton or 
Open Structures. By Edward Sang, . . . .575 
On Vortex Motion. By Professor Sir William Thomson, . . 576 
On the Ultramundane Corpuscules of Le Sage. By Professor Sir W. 
Thomson, . . . . . . . .577 
Note on Spherical Harmonics. By Professor Tait, . . .589 
Laboratory Notes : On Thermo-Electricity. By Professor Tait, . 597 
On the Relation of Magnetism to Temperature. By D. H. Marshall, 
Esq., M.A., Assistant to the Professor of Natural Philosophy. 
Communicated by Professor Tait. (With a Plate), . . 603 
Note on a Singular Property of the Retina. By Professor Tait, . 605 
On the Operator <£>(v). By Professor Tait, .... 607 
Note on Pendulum Motion. By Professor Tait, . . . 608 
