1845.] On the Assam Petroleum Beds. 821 



pounded. It would, I think, make a cement similar to Parker's, or the 

 Roman cement. 



No. 4, contains specimens of a conglomerate containing lime, form- 

 ing a conspicuous rock a mile from this, directly on the edge of the 

 river on both sides. In connection with this, indeed in some places 

 adhering to its lower surface, as well as in the bed of the river itself 

 at the same place, is the blue rock containing lime ; from the quantity 

 of pure carbonate of lime adhering to the surface of one of the pieces, 

 we might reasonably suppose that a rock even purer than the specimens 

 now sent, does exist in the same place ; but the depth of the water will, 

 I am afraid, effectually prevent its being worked ; what is found of this 

 blue rock however, when burnt carefully, slakes into a very good buff 

 coloured lime, quite fit for building purposes. The conglomerate when 

 burnt, partially slakes, and, when pounded up, forms a very strong 

 cement, well adapted for flooring or roofs, or lining of water tanks, &c. 

 Accompanying these specimens, I have sent a sample of a mixture of 

 Asphalte earth, and pounded unburnt conglomerate fused with a small 

 quantity of the mikai tree rosin, also a few pieces of the clay and ore 

 of the soil of the hills of the Petroleum locality : there appears to be 

 too much earth in it ; as another trial I have made by covering the top 

 of my boat, has succeeded very well, I do not see why we could not 

 use the earthy Asphalte with success, in covering matting or plank roofs 

 of boats or houses ; it deserves a trial certainly. 



Remarks upon the occurrence of Granite in the bed of the Narbudda. 



By Capt. J. Abbott, B. A. Late Principal Assistant Commissioner, 



Nimarr. 



In a report upon the Mhahlie Cotton of Nimarr, which I prepared 

 about two years ago, and which, I believe, reached the Asiatic Society, 

 I stated, that the trap stratum of Malwa was not penetrated to its 

 base, even by the river Narbudda, which has mined its bed 1600 feet 

 below the table summit of the Vindhecias. 



Some weeks after the despatch of this report, I visited an island 

 of the Narbudda, opposite Mundlaisir, in order to inspect a block of 

 grey granite, which I supposed had been accidentally deposited there. 



