CONTENTS. 



NOTES ON GEOLOGY OF THE DISTRICTS VISITED. 



PAGE 

 Limestone caves — Metalliferous region — Gneissic formations — Occur- 

 rence over large area — Their decomposition on a gigantic scale in 

 Brazil^Production of canyons by deluges of the vret seasons — 

 Erosion of valleys — Watersheds of rivers changed — Fantastic rocks 

 — Corcovado Railway — Petropolis Railway — Engineering difficulties 

 — Causes of decomposition — The glacial theory — Ancient tem- 

 perature at the Equator — Animal remains in caves — Refutation of 

 glaciation — Thickness of gneiss in Brazil ... ... ... 421 



List of Books, etc., referred to ... ... ... ... 429 



Index 



431 



