vi Pi'eface to the Second Edition. 



vations made during the voyage of the ' Beagle,' I will 

 here give references to four papers which were separately 

 published. First, ' On the Connection of certain Vol- 

 canic Phenomena in South America, 5 read in 1838, and 

 published in Volume V, of the £ Transactions of the 

 Geological Society.' Secondly, ' On the Distribution 

 of the Erratic Boulders and on the contemporaneous 

 Stratified Deposits of South America,' read in 1841, and 

 published in Volume VI. of the ' Transactions ' of the 

 same Society. Thirdly, ' An Account of the Fine Dust 

 which often falls on Vessels in the Atlantic Ocean : ' 

 'Proceedings of the Geological Society,' June 4, 1845. 

 Fourthly, on March 25, 1846, in the same Journal, 

 ' On the Geology of the Falkland Islands.' 



