FOLDS AND FAULTING. 413 



still further complicated the discussion, but special stress 

 was laid on the thrust planes, which were regarded as re- 

 versed faults of very low hade. It is along such planes 

 that the rocks in Durness have been thrust a distance of 

 over ten miles. Here had taken place the re-arrangement 

 of the mineral particles, giving rise to the crystalline schists 

 already referred to, whilst at the same time the vertical 

 worm tubes in the quartzites underlying the thrust plane 

 have been flattened, drawn out, and bent over in a direction 

 perpendicular to the strike of the same {Nature, 1884, 



PP- 29-35)- 



The final result of the great contest was hailed on all 



hands with the liveliest satisfaction. Professors Lapworth, in 

 the Geological Magazine, Bonney, at the Geological Society, 

 and Judd, in his presidential address before the British 

 Association, 1885 (wherein he specially recalls the impor- 

 tant services rendered by Nicol in the controversy), all 

 recognised the importance of the new departure. The 

 first two of these observers had already taken part in 

 the fray, whilst the latter, after a visit to the ground, 

 recognised the truth of Nicol's position, and in 1877 

 had urged him to re-open the whole question, but un- 

 availingly. 



Younger students can now follow with interest the 

 varied phases and details of this battle of giants, and, 

 whilst learning many a valuable lesson from their failures 

 and defeats, may profit by their discoveries and their 

 triumphs. 



BIBLIOGRAPHY. 



(1) Rogers, H. D. Trans. Royal Soc, Edinburgh, vol. xxi., p. 



43i- 



(2) De la Beche, Sir H. Quart. Jour. Geo/. Soc, p. 55, 



1849. 



(3) MURCHISON, Sir R. Quart. Jour. Geo/. Soc, vol. v., p. 



248. 



(4) Nicol. Quart. Jour. Geo/. Soc, p. 36, 1857. 



(5) MURCHISON, SIR R. Quart. Jour. Geo/. Soc, p. 353, 1858-9. 



(6) NlCOL. Quart. Jour. Geo/. Soc, p. 85 et seq., 186 1. 



29 



