94> 



after the latter period always to the left, after a given hour of day 

 During the early sun, however, they were to the right-hand, and as 

 the sun approached a given altitude, they were invariably to the 

 left-hand. Deflections observed during the summer season were 

 also to the left-hand; but those of the early sun were not submitted 

 to the test. 



On testing the instrument with a voltaic pair, it was shown that 

 the current passed from south to north above the needle with the early 

 sun, or when the indicator deflected to the right-hand, and beneath 

 the needle with the rays which proceeded from a considerable eleva- 

 tion, or when the needle deflected to the left-hand. 



In conclusion, the author states that the results of these experi- 

 ments evince to his mind more than ever the unity of force; and 

 that experimental evidence appears to justify the conclusion at 

 which he has long since arrived, that there is one, only, universal force 

 in nature, which is modified by the accidental and varied conditions 

 to which it is subjected, but that its essential nature and characteristics 

 are at all times unchangeably the same. 



11. " On the Mean Temperature of the Observatory at Highfleld 

 House, near Nottingham, from the year 1810 to 1850." By Edward 

 Joseph Lowe, Esq., F.R.A.S. Communicated by Marshall Hall, 

 M.D., F.R.S. Received May 3, 1851. 



The object of the author in this communication is to connect the 

 series of thermometrical observations made by the late Matthew Need- 

 ham, Esq., at Lenton House, at the distance of only 200 yards from 

 the observatory of Highfleld'' House, with those made by himself from 

 1842 to the present time at the latter place. He procured Mr. Need- 

 ham's observations from the Committee of the Bromley House Li- 

 brary, Nottingham, and also the instrument with -which they were 

 made, and which, upon comparison with his own standard, was found 

 by Mr. Glaisher to be correct. 



Mr. Needham's observations were registered at 8 a.m. and ] 1 p.m., 

 and to the monthly means of these records corrections have been 

 applied to convert them into mean monthly values. Those made by 

 the author were registered at 9 a.m. and 9 p.m., and these, together 

 with the highest and lowest readings of self-registering thermometers, 

 have been subjected to the same process. 



The following tables deduced from the observations are given in 

 the paper : — 



1. The mean temperature of each month at Highfleld House from 

 1810 to 1850. 



From this table are deduced the mean temperature of each month 

 from all tlie observations, viz. 



January 36°'2 ; February S8°*9 ; March 42°-4 ; April 47°-6 ; May 

 53°-6; June SS""'? ; July 61°-1 ; August 60°'2 ; September 56°-6 ; 

 October 50°'0 ; November 42°-9 ; December S9°-l. 



2. The highest and lowest monthly mean temperature in every 

 year, from 1810 to 1850, with the amount of diflTerence of tem- 

 perature. 



