Vlll 
Contents. 
PAGE 
At the request of the Council, Professor Schuster give an Address on 
the Discharge of Electricity through Gases, with Experimental 
Illustrations, ....... 646 
The Enumeration, Description, and Construction of Knots with 
fewer than Ten Crossings. By the Rev. T. P. Kirkman, F.R.S. 
Communicated by Professor Tait, ..... 646 
On Knots. Part II. By Professor Tait, .... 647 
Second Note on the Remarkable Sunsets. By Mr John Aitken, . 647 
Thermometer Screens. By Mr John Aitken. (Plate VI.), . . 661 
Abstract of Paper on Micrometrical Measures of Gaseous Spectra. 
By Professor C. Piazzi Smyth, ..... 696 
On the Computation of Recurring Functions by the aid of Chain- 
Fractions. By Edward Sang, LL.D., .... 703 
On Extensions of Euclid I. 47. By Mr A. H. Anglin, . . 703 
Report on the Ophiuroidea of the Faroe Channel, mainly collected 
by H.M.S. “ Triton” in August 1882, with some Remarks on the 
Distribution of the Order. By Mr W. E. Hoyle, M.A. (Oxon.), 
M.R.C.S., Naturalist to the “Challenger” Commission. (Plate 
VII. ), 707 
On the Principles of Economics. By Mr P. Geddes. Part V., 
Psychological, . . . . . . .730 
A Problem on Point-Motions for which a Reference-Frame can so 
exist as to have the Motions of the Points relative to it. Rectilinear 
and Mutually Proportional. By Professor James Thomson, . 730 
Note on Reference Frames. By Professor Tait, . . . 743 
Note on the Occurrence of Drifted Trees in Beds of Sand and Gravel 
at Musselburgh. By Professor James Geikie, LL.D., F.R.S., . 745 
On a Special Class of Partitions. By Professor Tait, . .755 
Observations on a Green Sun, and Associated Phenomena. By Prof. 
C. Michie Smith, . . . . . . .755 
Analysis of the Principles of Economics. Part V., Psychological. 
By Mr P. Geddes, . . . . . , . . 755 
On a Singular Electrical Result. By Mr Harry Rainy. Communi- 
cated by Professor Tait, . . . . . . .756 
Observations on Coral Reefs and Calcareous Formations of some of 
the Islands in the Solomon Group. By H. B. Guppey, M.D., 
H.M.S. “ Lark,” with Notes by Mr John Murray. Communicated 
by Mr John Murray, . . . . . .757 
Further Note on the Compressibility of Water. By Professor Tait, 757 
Critical Note on the latest Theory in Vertebrate Morphology. By 
Mr J. T. Cunningham, B.A., ..... 759 
Tenth and Final Report of the Boulder Committee ; with Appendix, 
containing an Abstract of the Information in the Nine Annual 
Reports of the Committee ; and a Summary of the Principal Points 
apparently established by the information so received. (Plates 
VIII. to X.), 765 
Remarks by Mr Milne Home on presenting the Tenth Report of 
Boulder Committee, ...... 907 
