of the Barometer near Edinburgh. 167 



inch, or nearly half the observed amount in this latitude. It is, 

 therefore, not wonderful that the first observations, which wanted 

 the attached thermometer, should have been received with dis- 

 trust, and it is rather surprising that Mr DANIELL should have 

 so overlooked this source of error, as to have placed the utmost 

 confidence (in the first edition of his work) in the existence of 

 oscillations which might have been caused by a change of tem- 

 perature amounting to little more than 1 Fahrenheit ; and that 

 he should have published his deduction for the horary oscillation 

 at London from his own observations, which wholly wanted this 

 element. The last voyage of Captain Sir EDWARD PARRY af- 

 forded results worthy of the highest confidence, from observa- 

 tions with excellent instruments, of which the indications were 

 registered with an assiduity and precision which puts to the 

 blush anything of the kind, at least in Britain, destined to the 

 furtherance of the science of meteorology. These excellent ob- 

 servations indicate the existence of all the oscillations observed 

 in lower latitudes, including that at 4 A. M., which has rarely 

 been observed in any part of the globe, and give all the values 

 with a negative sign, relatively to the ordinary oscillations. The 

 six monthly means (Nov. 1824 April 1825) give every one the 

 negative tide from 4 A. M. to 10 A. M., and likewise from 10 A. M. 

 to 4 P. M., and from 10 P. M. to 4 A. M. ; and every month but one 

 from 4 P. M. to 10 P. M. As the greatest observed tide was that 

 from 4 A. M. to 10 A. M., or .0089 inch, I shall adopt it in future 

 computations, more especially as from three months' observations, 

 when the daily number was extended to twelve, the critical hour in 

 the afternoon appeared to be later than 4, perhaps considerably*. 



A similar fact with regard to Northern Europe has been suggested by some 

 observations made at the apartments of the Royal Society of London, in a paper by 

 Mr LUBBOCK, V.P.R.S. in the Phil. Trans, for 1831, of which the author has been 

 kind enough to favour me with a copy since this paper was read. 



Y 2 



