322 On the formation of the Table Lands of South India. 



It never occurs in extensive beds, but as veins and dykes in 

 the schistose series, and in euritic (Pallicondah) granite. 



It is never found associated with, or embedded in the solid 

 true hornblendic granite, and as remarked by Lieut. Smith, 

 the rock enclosing the dykes never shews any altered appear- 

 ance, nor is any change whatever, or sign of disruption to be 

 seen in the adjacent rocks. 



It occurs sometimes associated with globular greenstone . 



Basaltic Hornblende — Basalt. 

 I have already sufficiently defined these, while describing 

 the granitic formation of the Barramahal. 



Augite. 

 As augite is considered by some mineralogists as a variety 

 of hornblende, produced by being cooled in a different man- 

 ner from a state of fusion, it may be as well to mention it 

 here, although it does not form in South India any extensive 

 class of rocks. Augitic sienites occur, answering to the rock 

 mentioned by MacCulloch in the beds of the schistose series, 

 and crystals of augite occur in hornblende sienite forming to 

 gether a compound rock, which is not common, but deserves 

 •notice, as it is plainly shewn that the difference between the 

 two minerals is not produced as has been supposed. 



Topographical Remarks regarding Afghanistan, made during 

 the advance and residence of H. M. \3th Light Infantry, 

 between 1st of April 1839, to 3lst March, 1840. By 

 J. Robertson, M. D. Assistant Surgeon. Communicated 

 by Dr. Murray Insp. Genl. of Hospitals. 



Affghanistan is bounded on the north by the Hindoo- 

 Koosh, traversing the country from east to west ; on the east 

 by the Indus ; on the west the Desert separates it from Persia. 

 Beloochistan on the south separates it from the Indian ocean. 

 At one time Balk, beyond the Caucasus, was added to the 



