13t 



Ditto in J»U. 



Ditto is June. 



Ditto in May, 



Ditto in April, 



On the Dallonian Theory of 



'Morning at 8 .ST Ditto 24- 



^Xoon at 1 .50 Ditto 24 



['ivcnin- at 7 03 Ditto 24 



^ vioining at 8 30 Ditto 24 



J Noon at 1 33 Ditto 24 



'Evening at 7 04 Ditto 24 



r.Moming at 8 22 Ditto 24 



^Noon at 1 37 Ditto 24 



'livtnin^ at 6 14 Ditto 24 



^Morning at S 31 Ditto 24 



Lvooii at 59 Ditto 24 



'Evening at 5 46 Ditto 24 



Mngnetical Obs^rvatiom continued. 

 1S14. 



[Fkb. 



\Yest. 



West. 



WciU 



West, 



In taking the mean of the ohservations for the montli of Dec. 

 the observations made on the 3d and 30th are not included. Durinij 

 l!it^ f«Jtrgy weather the needle was remarkable steady. 



P.,-„ f„n „ ^Between noon of the lst"Dec. ) ri.^r\n ■ i,.. 

 am fallen •< „ r .i, i » t ? 0'400 inches. 

 I Between noon of the 1st Jan. j 



Article X. 



On the Dultoniaji Theory of Definite Proportions in Chemical 

 Combinations. By Thomas Thomson, M,D. F.R.S. 



{Continued from Vol. II, p, 301.) 



The nitrates, tlie composition of which I propose to exhibit in 

 this essay, have been hitherto very imperfectly and inaccurately 

 analyspd. I have been obliged to make some new experiinents on 

 the sulijeet. Guided by these, by the experiments of Bcrzelius, 



