710 
Proceedings of the Royal Society 
4. Notice of the Completion of the new Eock Thermometers 
at the Eoyal Observatory, Edinburgh, and what they are 
for. By Professor Piazzi Smyth, E.E.S.E. 
The nature of this paper may be understood from the following 
headings : — 
(1.) The making and placing of the new thermometers. 
(2.) Practically described by Mr Thomas Wedderburn. 
(3.) The problem with the old thermometers. 
(4.) Their next use in level fluctuations. 
(5.) Their employment by Sir Wm. Thomson. 
(6.) Their subsequent demonstration of the cycle of supra-annual 
waves of heat and cold. 
(7.) The published predictions in 1872 for 1878-80. 
(8.) The spoiled predictions in 1877, under the influence of 
erroneous sun-spot dates. 
(9.) The rectified predictions in 1879, when the true date of sun- 
spot minimum was ascertained by direct observation. 
(10.) How 7 to obtain correct dates for future sun-spot minima. 
Appendix I. — The contract for the new thermometers. 
Appendix II. — Account of works by Mr Eichard Adie. 
Appendix III. — Further account by Mr T. Wedderburn, of 
Adie & Son. 
Appendix IY. — The cyclical seasons of 1878-80, as predicted 
in 1872. 
Appendix Y. — Scottish meteorological data from 1821-1880, 
arranged in quadruple annual means for cyclical inquiries. 
Plate representing the above numerical tables, graphically. 
Monday , l§th Jidy 1880. 
Professor Sir W YYILLE THOMSON, Yice-President, 
in the Chair. 
The following Communications were read : — 
1. Eeport on Fossil Fishes collected by the Geological Survey 
of Scotland in Eoxburghshire and Dumfriesshire. Part I. 
— Ganoidei. By Dr E. H. Traquair. 
