184 Mr R. Edmonds on Sand- hillocks. 



already described ; so that (like the sand-hills of St Ives and 

 Whitesand bays) these sand-banks have apparently arisen 

 from successive deposits which did not cover the growing turf, 

 except occasionally, when, being more copious than usual, 

 they have completely buried it, although not so deeply as to 

 prevent its speedy reappearance above the sand. 



To this process of accumulation by the agency of the winds, 

 one very remarkable exception remains to be noticed. It oc- 

 curs in the bank near Marazion Bridge, where, in one in- 

 stance> a complete covering of the herbage appears to have 

 proceeded directly from tlie sea — from the waves of an earth- 

 quake,* or some extraordinary high tide coinciding with a 

 furious south wind. For in the section of this bank, a layer, 

 an inch or two thick, of small rounded pebbles, may be seen 

 3 feet below the surface, and more than 15 feet above the 

 level of high water ; whilst in the subjacent sand, deposited 

 probably by the winds alone, numerous perfect land shells 

 are imbedded throughout a depth of 4 or 5 feet beneath the 

 pebbles. 



SCIENTIFIC INTELLIGENCE. 



GEOLOGY AND MINERALOGY. 

 1. Example of apparent Drift- Furrows dependent on Struc- 

 ture. By C. B. Adams, State Geologist of Vermont^ 8fc. {Com- 

 municated for this Journal.) — The attention of geologists having 

 been lately called to the question, whether the grooves and strisc 

 commonly attributed to drift agency, may not be due to structure,-\ 

 it may not be improper, in anticipation of the results of the survey 

 of Vermont, to mention an example in which this is undoubtedly 

 the case. Mr Macintosh, the author of the article which is alluded 

 to, and which was read before the Geological Society of London, par- 

 ticularly suggests that such may be the origin of the examples in 

 the United States, described by President Hitchcock, — a suggestion, 

 we will venture to add, which must have occasioned much surprise 

 in those who are familiar with these effects of drift agency in the 

 New England States, unless they also may have met with facts of 

 the same nature with those which are the subject of this brief notice. 



* See Trans, of the Royal Geological Society of Cornwall, 1843, p. 113. 

 t In this Journal, 2d Ser,, vol. i., p. 277; and Sir R. 1. Murchison's Geo- 

 logy of Russia and the Ural Mountains, vol. i., p. 566. 



