General Literature. 207 



pleted an elementary work on geology, and that he is engaged 

 in a description of Shetland, upon the same plan as that of the 

 Western Isles of Scotland, which he published last year. 



13. Mineralogy of Scotland. — ^Prehnite has hitherto only 

 been found in Scotland in trap ; it is thus abundant near Glas- 

 gow and Dumbarton ; it also occurs at Edinburgh, in Fife, and 

 in the isles of Mull, Rasay, Arran, and Sky. 



This mineral has lately been found in the north of Scotland, 

 in gneiss ; it occurs in the same botryoidal form as in the Kil- 

 patrick hills. It has also been found in the same rock, imper- 

 fectly crystallized, in the island of Guernsey. 



Hollow spar has been lately discovered, for the first time, in 

 Scotland ; it occurs in clayslate, in the vicinity of Balahulish. 



Cyanite, which has hitherto only been found in Shetland, and 

 at Boharm, in Banffshire, exists also in Cairnlia, one of the 

 summits of Ben-y-Gloe, and in Glen-Tilt ; it is embedded in 

 quartz. 



Staurolite has lately been, for tlie first time, found in the north 

 of Scotland, in mica-slate ; the crystals are perfect, and occur 

 both simple and crossed ; they are of a large size, but differ in 

 composition from those of Brittany and Switzerland ; their colour 

 is dark lead-gray ; and their fracture not unlike that of clay- 

 stone. 



14. St. George* s Medical and Chemical School. — ^Thef Courses 

 will commence on Tuesday, October the 5th. 



1 . — On the Laws of the Animal Economy, and the Practice of 

 Physic, with Pathological Demonstrations; at nine in the morn- 

 ing, by George Pearson, M.D. F.R.S., senior physician to St. 

 George's Hospital, ^c. <^c. 



2. — On Chemistry, in which Medical Jurisprudence will be 

 introduced, by W. T. Brande, Sec. R. S., Professor of Chemistry 

 at the Royal Institution, ^c. 



3. — On Therapeutics, with Materia Medica; at eight in the 

 morning, by George Pearson, M.D. F.R.S., ^c. 



4. — Surgical Lectures, gratuitously, to the Pupils of St. 

 George's Hospital, will be given by Sir Everard Home, Bart. 



Proposals and Particulars may be had at No. 9, George-Street, 

 Hanover-Square, and at St George's Hospital. 



