2o8 POPULAR LECTURES AND ADDRESSES. 



mantle, nothing from the southern hemisphere was 

 found sufficiently complete for the harmonic 

 analysis except a year's observations of a self-re- 

 gistering tide-gauge at Port Louis, Mauritius, and 

 personal observations made at regular hourly, and 

 sometimes half-hourly, intervals for about six 

 months (May to December) of 1842, at Port Louis, 

 Berkeley Sound, East Falkland, under the direction 

 of Sir James Clark Ross. These have been sub- 

 jected to complete analysis. 



So also have twelve months' observations by a 

 self-registering tide-gauge during 1871-2 at Malta, 

 contributed by Admiral Sir A. Cooper Key, K.C.B., 

 F.R.S. 



Tide-curves for two more years of Toulon (1847 

 and 1848) in addition to the one (1853) previously 

 analysed, and for Marseilles for a twelvemonth 

 of 1850-51, supplied by the French Hydrographic 

 Office, have also been subjected to the harmonic 

 analysis. 



[The numerical results obtained will be found in 

 Nature, October 24, 1878 (vol. xviii. p. 670).] 



