Dr. Ure eii AnhyUrous Sulphuric Add, ^63 



tartar, of which 90 grains were required. These 90 grains ai-e 

 equivalent to 51.5 grains of dry sulphuric acid. Now 987 grains 

 of the dilute acid of Nordhausen, contained of the solid sublimate 

 £2.9 grains, giving an excess of weight = 1.4 gr., due, most pro- 

 bably, to the adherence of moisture to the surface of the sublimate : 

 112 grains of dry sulphate of potash were obtained by evaporating 

 the above saline solution. This portion of ignited salt contains 61 

 grains of dry sulphuric acid. 



From the preceding Experiments, it seems likely that the white 

 sublimate from the Nordhausen oil of vitriol is anhydrous sul- 

 phuric acid. 



I am, dear Sir, 



Yours, ^c. 

 Glasgow, March Ist, 1825, Andrew Ure. 



AitT. VIII. — Outlines of Geology, being the Substance of a 

 Course of Lectures on that Subject, delivered in the Am- 

 phitheatre of the Royal Institution of Great Britain, by 

 William Thomas Brande, F.R.S., Professor of Chemis- 

 try in the Royal Institution, 8cc. 



[This abstract of the above Lectures is published at thfe request of several 

 of the Members of, and Subscribers to, the Royal Institution ; they are 

 intended to shew the objects of Geological Science, and to furnish the 

 student with an outline which may assist his progress in the pursuit of the 

 study. The general arrangement of the subject nearly corresponds with 

 that adopted by Messrs. Conybeare and Phillips, in the first part of their 

 excellent work on the Geology of England and Wales ; from which, and 

 from the invaluable collection of fads contained in the Geological Trans- 

 actions, ample abstracts will be found in the following pages. To those 

 works the geological student is especially referred, for such details as 

 were inconsistent with the plan of a popular course of lectures upon so ex- 

 tended a subject ] 



I SHALL endeavour, in this preliminary discourse, to give ia retf 

 brief outline of the origin and progress of geological science ; 

 to explain particularly the mode of pursuing it which it is pro*- 



