,30 Schwartz & Beevor, Dawn of Human Intention. 



rounded blocks which are moved by the waves, certain 

 forms are produced which simulate Eoliths, but a further 

 exposure to this action speedily destroyed them. 



(96) The same effect follows in streams, the action 

 in this case being one of abrasion rather than dis- 

 integration. Stream action on Palaeoliths as well as on 

 Eolithic forms associated with them is one of rounding of 

 edges rather than of flaking. MM. de Munck and 

 Ghilain* have independently carefully investigated the 

 action of rapid streams fed with angular fragments of 

 flint and with true Eoliths which were contained in the 

 beds, through which the upper reaches of the river ran. 



Specimens from the river bed were taken from various 

 points down the stream, with the result that in a distance 

 of from I to 2 miles, the angular flints and Eoliths had 

 been transformed into rounded pebbles. Specimens from 

 the intermediate points shewed that the action was one of 

 abrasion and not of chipping. 



(97) The experiments of MM. Boulef and Obermaier 

 with wash mills fitted with iron harrows cannot be 

 considered as having been carried out under conditions 

 comparable with those obtaining in natural streams. 

 F. J. BennettJ found that in the Kentish wash mills the 

 flints which had been in the mill a considerable time and 

 were out of the reach of the iron harrows were almost 

 perfectly smooth spheres. 



(98) Striation and ' ladder fracture ' are concomitants 

 of ice action, and Eoliths subjected to this ai^ent are easily 

 recognisable. 



* Congrfes prehislorique de France, Autun, 1907. '' La fin de la question 

 des Eoliths," A. Rutot. 



t " L'origine des Eoliths," Marcelin Boule, L'' Anthi-opologic, vol. 16, 

 March-April, 1905. 



X Geological Magazine , 1906, Decade v., iii, 69-72, 143-4. 



