66 Lieut.-General R. Strachey. Harmonic Analysis [Mar. 2, 



Mott, Frederick Walker, M.D. 

 Newton, Edwin Tally, F.G.S. 

 Notter, James Lane, Surgeon- 



Lieut.-Col. 

 Oliver, John Ryder, Major- 



General R.A. 

 Ord, William Miller, M.D. 

 Reade, Thomas Mellard, F.G.S. 

 Roberts, Ralph A., M.A. 

 Rutley, Frank, F.Gr.S. 

 Salomons, Sir David, M.A. 

 Sherrington, Charles Scott, M.B. 

 Stebbing, Rev. Thomas Roscoe 



Rede, M.A. 

 Stevenson, Thomas, M.D. 

 Stewart, Professor Charles, 



M.R.C.S. 

 Stirling, Edward C, M.D. 

 Thomson, Professor John Miliar, 



F.C.S. 



Thornycroft, John Isaac, M.Inst. 

 C.E. 



Trail, Professor James William 



Helenas, M.D. 

 Tuke, Daniel Hack, M.D. 

 Ulrich, Professor George Henry 



Frederick, F.G.S. 

 Veley, Victor Hnbert, M.A. 

 Wallace, Alfred Rassel, LL.D. 

 Waterhoase, James, Colonel. 

 Watkin, Henry Samnel Spiller, 



Lient.-Col. R.A. 

 Webb, Francis William, M.Inst. 



C.E. 



Woodward, Horace Bolingbroke, 

 F.G.S. 



Worthington, Professor Arthnr 



Mason, M.A. 

 Yoang, Professor Sydney, D.Sc. 



The following Papers were read 



I. " Harmonic Analysis of Hourly Observations of Air Tem- 

 perature and Pressure at British Observatories. Part I. 

 Temperature." By Lieut.-General R. Strachey, R.E., 

 F.R.S. Received January 20, 1893. 



(Abstract.) 



This paper is a discussion of the results of the computations of 

 the harmonic constants contained in a volume recently published by 

 the Meteorological Office. The tables in this volume give the con- 

 stants of the harmonic components of the first four orders, for each 

 month for twenty years, of the daily curves of temperature and pres- 

 sure at Greenwich ; and the constants for the first three orders, for 

 the temperature and pressure, for each month for twelve years, at the 

 seven observatories maintained by the Meteorological Office. 



The tables supply the values of the coefficients of the cosines and 

 sines of the several terms of the usual harmonic series, representing 

 any hourly value : — 



A n = p +p 1 cos n . 15° + q t sin n . 15° + &c (1). 



They also give the amplitudes of the several components, and the 

 epoch of maximr.m derived from the formula 



