164 T. H. Holland — Slab of Chinese Agglomerate Lava. [No. 3, 



Job Cliarnock's tombstone with the pypersthene-granites of the 

 Madras Presidency ; and from its proximity to tbe cost and to Madras, 

 it seems likely that Pallavaram would have been selected by the earlier 

 agents of the East India Company as a source of this handsome rock. 

 Nearly all the old tombstones collected together in St. John's Church- 

 yard are of the same rock ; for example that of Job Cliarnock's son-in- 

 law, Jonathan White (1703), and Mrs. Jane Smart (1753). 



Briefly, the points in which these rocks agree with those of Pal- 

 lavai^am, and upon which I base this identification, are these : — 

 (a). Structure : — 



(1). Micro-perthitic structure. 

 (2). Grranophyric (micro-pegmatitic) structure, 

 (b). Composition: — 



(1). The presence of potash-felspar in the form of 



microcline. 

 (2). ,, hypersthene. 



(3). „ blue quartz. 



(4). ,, almandine garnet. 



(c). The combination of these minerals with the above-named 

 structures. In this association hypersthene is especially note-worthy 

 for the reasons already stated. 



As this is a new type of rock, and modifications of it occur by the 

 introduction of accessory minerals, I would suggest for it the name 

 Charnockite, in honour of the founder of Calcutta, who was the uncon- 

 scious means of bringing, perhaps, the first specimen of this interesting 

 rock to our capital. 



On a slab of Chinese agglomerate lava bearing a Chinese inscription dis- 

 covered in St. John's Churchyard, Calcutta. By T. H. Holland, 

 A.R.C.S., F.Gr.S., Geological Survey of India. 



[Received October 26th ;— Read November 1st, 1893.] 

 (With Plate VII.) 



Through the kindness of the Revd. H. B. Hyde, I have been en- 

 abled to examine the slab bearing a Chinese inscription and discovered 

 by him in St. John's Churchyard. 



The slab has been imperfectly polished on the face bearing the in- 

 scription, and at first sight presents the character of a common artificial 

 concrete, for which I at first mistook it. But on removing a fragment 

 from the back of the slab and examining it in the laboratory, I found it 



