318 INDEX. 



Digestion of worms, 37 



extra-stomachal, 43 



Disintegration of rocks, aided by worms, 240 



Distribution of worms, 120 



Down, amount of earth here brought annually to the 



surface, 137 

 Downs near Winchester, valleys in, 301 

 Dust, distance transported, 235-237 



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

 129 



amount of, which flows down a given slope, 266 



swallowed as food, 100 



weight of, ejected from a single burrow, 160 



Eisen, number of species of worms, 9 



depth of buiTows, 110 



Ejection of castings, 116 

 Embankments on hiU-sides, 278, 282 

 Encampments, ancient, 290 

 Ernst, Dr., on worms at Caracas, 121 

 Excavation of the burrows, 98 



Fabre, M., on the instincts of Sphex, 93 



Earrer, Mr. T. H., on the Eoman villa at Abinger, 



178-188 

 Fat eaten by worms, 36 

 Fields formerly ploughed, 292 

 Fish, Mr., criticisms on my views, 6 

 Flints, standing vertically in the residue over the chalk, 



138 

 acted on externally and internally by atmospherio 



agencies, 245 

 Flowing down of castings, 261 

 Fluid, digestiTe, of worms, 37 



