174 FRAGMENTS OF SCIENCE. 



A map of the district, with the parallel roads shown, is 

 annexed. 



LITERATURE OF THE SUBJECT. 



THOMAS PENNANT. A tour in Scotland. Vol. iii. 1776, p. 394. 

 JOHN MACCULLOCH. On the Parallel Roads of Glen Roy. Qeol. 



Soc. Trans, vol. iv. 1817, p. 314. 

 THOMAS LAUDER DICK (afterward SIR THOMAS DICK-LAUDER, 



Bart.). On the Parallel Roads of Locbaber. Edin. Roy. Soc. 



Trans. 1818, vol. ix. p. 1. 

 CHARLES DARWIN. Observations on tbe Parallel Roads of Glen Roy, 



and of tbe other parts of Locbaber in Scotland, with an attempt 



to prove that they are of marine origin. Phil. Trans. 1839, vol. 



cxxix. p. 39. 

 SIR CHARLES LYELL. Elements of Geology. Second edition, 



1841. 

 Louis AGASSIZ. The Glacial Theory and its Recent Progress 



Parallel Terraces. Edin. New Phil. Journal, 1842, vol. xxxiii. 



p. 236. 

 DAVID MILNE (afterward DAVID MILNE-HOME). On tbe Parallel 



Roads of Locbaber; with Remarks on the Change of Relative 



Levels of Sea and Land in Scotland, and on tbe Detrital Deposits 



in that Country. Edin. Roy. Soc. Trans. 1847, vol. xvi. p. 395. 

 ROBERT CHAMBERS. Ancient Sea Margins. Edinburgh, 1848. 

 H. D. ROGERS. On tbe Parallel Roads of Glen Roy. Royal Inst. 



Proceedings, 1861, vol. iii. p. 341. 

 THOMAS F. JAMIESON. On the Parallel Roads of Glen Roy, and 



their Place in the History of the Glacial Period. Quart. Journal 



Geol. Soc. 1863, vol. xix. p. 235. 



SIR CHARLES LYELL. Antiquity of Man. 1863, p. 253. 

 REV. R. B. WATSON. On tbe Marine Origin of tbe Parallel Roads 



of Glen Roy. Quart. Journ. Geol. Soc. 1865, vol. xxii. p. 9. 

 SIR JOHN LUBBOCK. On tbe Parallel Roads of Glen Roy. Quart. 



Journ. Geol. Soc. 1867, vol. xxiv. p. 83. 

 CHARLES BABBAGE. Observations on the Parallel Roads of Glen 



Roy. Quart. Journ. Geol. Soc. 1868, vol. xxiv. p. 273. 

 JAMKS NICOL. On tbe origin of tbe Parallel Roads of Glen Roy. 



1869. Geol. Soc. Journal, vol. xxv. p. 282. 

 JAMES NICOL. How the Parallel Roads of Glen Roy were formed. 



1872. Geol. Soc. Journal, vol. xxviii. p. 237. 

 MAJOR-GENERAL SIR HENRY JAMES, R. E. Notes on the Parallel 



Roads of Lochaber. 4to. 1874. 



discourse here reported by the model just described, constructed 

 under tbe supervision of my assistant, Mr. John Cottrell. Glen 

 Gluoy with its lake and road and tbe cataract over its col; Glen Roy 

 and its three roads with their respective cataracts at tbe bead of Glen 

 Spey, Glen Glaster, and Glen Spean, were all represented. The 

 successive sbiftings of tbe barriers, which were formed of plate glass, 

 brought each successive lake and its corresponding road into view, 

 while tbe entire removal of the barriers caused the streams to How 

 down the glens of the modelas they flow down the real glens of to- 

 day. 



