RliCOMMENDATlONS. 471 



TIDES. 



* That a sum not exceeding ^OOl. be devoted to the discussion 

 of observations of the Tides, and the formation of Tide Tables, 

 under the superintendence of Mr. Baily, Mr. Lubbock, Rev. 

 G. Peacock, and Rev. W. Whewell. 



That the Association should endeavour to procure the gene- 

 ral establishment of systematic Tide Observations along the 

 coasts of Great Britain and Ireland, and that the standing Com- 

 mittee on Tides be requested to select such places ' as may 

 appear to them most important for this purpose ; that the di- 

 rection, and, if possible, the intensity of the wind should be ob- 

 served, as well as its critical changes after having set for some 

 time in a particular direction ; and that the altitude of the cur- 

 rents of air should also be, as far as possible, remarked. 



METEOROLOGY. 



1 . That the Committee in India be requested to institute such 

 observations as may throw light on the horary oscillations of 

 the barometer near the equator. 



2. That the Committee in India be requested to institute a 

 series of observations of the thermometer during every hour of 

 the day and night. 



3. That a similar hourly register be established at some mili- 

 tary or naval station in the South of England^. 



4. That the decrease of temperature at increasing heights in 

 the atmosphere should be investigated by continued observa- 

 tions at stated hours and known heights. The hours of 9;^ 

 A.M. and 8y p.m., as giving nearly the mean temperature of the 

 year, are suggested for the purpose. (See Report, p. 218.) 



5. That persons travelling on mountains, or ascending in bal- 

 loons, should observe the state of the thermometer, and of the 

 dew-point hygrometer, below, in, and above the clouds, and 

 determine how the different kinds of clouds differ in these re- 

 spects. (See Report on Meteorology, vol. i. p. 245.) 



6. That the temperature of springs shou.ld be observed at 

 different heiglits above the mean level of the sea, and at dif- 

 ferent depths below the surface of the earth, and compared with 



• Directions for observing the Tides, extracted from Mr. Lubbock's Report, 

 and Mr. Wbewell's Memoranda, are inserted in the Appendix. 



- Observations in agreement with this recommendation have been commenced 

 at Plymouth and Devonport, under the directions respectively of Mr. G. Har- 

 vey and of Mr. Wm. Snow Harris. 



