THE PARALLEL ROADS OF GLEN ROY 241 



that where truth once could not find an entrance it event- 

 ually finds a home. 1 



LITERATURE OF THE SUBJECT 



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



JOHN MAcCuLLOCH. On the Parallel Roads of Glen Roy. Geol. Soc. Trans, 

 vol. iv. 1817, p. 314. 



THOMAS LAUDER DICK (afterward SIB THOMAS DICK-LAUDER, Bart.}. On the 

 Parallel Roads of Lochaber. Edin. Roy. Soc. Trans. 1818, vol. ix. p.'l. 



CHARLES DARWIN. Observations on the Parallel Roads of Glen Roy, and of 

 the other parts of Lochaber 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. 



Loms AGASSIZ. The Glacial Theory and its Recent Progress Parallel Ter- 

 races. Edin. New Phil. Journal, 1842, voL xxxiii. p. 236. 



DAVID MILNE (afterward DAVID MILNE-HOME). On the Parallel Roads of 

 Lochaber; with Remarks on the Change of Relative Levels of Sea and 

 Land in Scotland, and on the 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 the 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. 



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



REV. R. B. WATSON. On the Marine Origin of the Parallel Roads of Glen Roy. 

 Quart. Journ. Geol. Soc. 1865, vol. xxii. p. 9. 



1 The formation, connection, successive subsidence, and final disappearance 

 of the glacial lakes of Lochaber were illustrated in the discourse here reported 

 by the model just described, constructed under the supervision of my assistant, 

 Mr. John Cottrell. Glen Gluoy with its lake and road and the cataract over its 

 col; Glen Roy and its three roads with their respective cataracts at the head of 

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

 sive shiftings of the barriers, which were formed of plate glass, brought each 

 successive lake and its corresponding road into view, while the entire removal 

 of the barriers caused the streams to flow down the glens of the model as they 

 flow down the real glens of to-day. 



SCIENCE 11 



I 



