320 INDEX. 



Denudation of the land, 232 

 Depth to which worms burrow, 111 

 Digaster, 249 

 Digestion of worms, 38 



extra-stomachal, 44 



Disintegration of rocks aided by worms, 238 



Distribution of worms, 122 



Down, amount of earth here brought annually to the- 



surface, 139 



Downs near Winchester, valleys in, 304 

 Dust, distance transported, 237-239 



Earth, amount of, brought to the surface by worms, 

 131 



amount of, which flows down a given slope, 269 



swallowed as food, 102 



weight of, ejected from a single burrow, 163 



Eisen on the number of species of worms, 9 



on the depth of burrows, 112 



Ejection of castings, 118 

 Embankments on hill-sides, 281, 285 

 Encampments, ancient, 293 

 Ernst, Dr., on worms at Caracas, 123 

 Excavation of the burrows, 100 



Fabre, M., on the instincts 'of Sphex, 95 



Farrer, Mr. T. H., on the Roman villa at Abinger, 



180-190 



Fat eaten by worms, 38 

 Fields formerly ploughed, 295 

 Fish, Mr., criticisms on my views, 6 

 Flints standing vertically in the residue over the chalk, 



140 

 acted on externally and internally by atmospheric 



agencies, 248 



