xl. 



Lectdke IV. — April 30th. 



The plains of Adelaide, Wilhmga, &c, the beds of deserted lakes. General 

 character of their deposits, and of the auriferous drifts. Are we drying up ? 

 The erosive action of rivers ; the recession of the Wannon Falls. The origin 

 of the gorge of the River Murray, and proofs of a former lake-expansion of 

 the Murray waters over the Murray plateau. 



Nature and origin of the white limestone of Adelaide. 

 Lecture V. — May 7th. 



The origin of our salt lagoons and of the brackish waters of our wells. 

 Lake Torrens — an arm of Spencer's Gulf, or a salt lagoon ? Underground 

 drainage in the South-Eastern Districts. The Adelaide hills once enveloped 

 in perpetual snow : the ice-worn aspect, and other evidences of glacial action. 

 Ice-borne granitic blocks on Yorke's Peninsula ; ice scratches in the valley 

 of the Inman. 



Lecture VI. — May 14th. 



The extinct gigantic animals of the Pliocene period, and their relationship 

 to the existing fauna. 



Eetrospect. The subsequent climatic changes which gave rise to the 

 present order of things. The extinction of the large animals. 



The volcanoes of the South-east ; proofs of then - comparative recentness. 

 Distribution of volcanic material beyond the present volcanic centres. 



Lectures VII. and VIII.— May 21st and May 28th. 



South Australia an archipelago during the Miocene period. The rocks of 

 the period, as exhibited in the cliffs of Aldinga Bay, Yorke's Peninsula, the 

 River Murray, &c. The origin of the sediments constituting the same. 



The littoral character of the deposits at Gawler, Morphett Vale, Lake 

 Torrens, &c. 



The semi-tropical character of the marine productions of the period — 

 colossal sharks, carnivorous whales, &c. The relation of the fauna to recent 

 and past periods. 



Deep-sea soundings, and life off the Australian shores. 



Lecture IX. — June 18th. 



Jurassic formation of the interior. 



The geological structure of the Adelaide hills ; two distinct sets of 6trata 

 — the older and metalliferous, the younger and non-metalliferous. The 

 ancient volcanoes of the Adelaide hills, and their association with the gold 

 and copper bearing rocks. 



Lecture X. — June 25th. 



On the probable presence of true coal in South Australia ; and on the 

 relative ages of true coal and lignites. Nature and origin of the substance 

 called " Coorongite." 



As most of the facts, then communicated, were chiefly 

 acquired by personal observation, extending over the brief 

 period of fifteen months, I doubted whether my generalizations 

 about such a vast and unexplored region as South Australia 

 would not require considerable modification as the result of 

 more extended observation. This fear restrained me from 

 publishing the lectures ; but having greatly extended the area 

 of observation, and having been assisted by other workers, in 

 the interval of more than two years, which has elapsed since 

 the delivery of the lectures, I present you with more confi- 

 dence these " Outlines of South Australian Geology," which 

 are, however, based on them. The interest that is shown for 



