X PREFACE. 



abovej the coal of the Khasi hills, which had been authoritatively re- 

 ferred to the age of the European " coal measures," has *been shewn 

 to be tertiary, the same fact has been established for the similar coal of 

 the Tenasserim Provinces. 



The second volume of these Memoirs will be devoted almost exclusive- 

 ly to Central India, (the Nerbudda, Bundelcund, &c.) and will carry 

 still further, the description of the relative position and relation of the 

 several series and groups of Indian rocks. 



The difficulty of procuring good illustrations for such Memoirs in this 

 country, is only known to those who have had actual experience of it. 

 I only refer to it here, to express a hope that I shall be able, for future 

 volumes, to secure something more satisfactory than are several of the 

 bald outlines which appear in the present. 



