LOCAL RESEARCHES AND DESCRIPTIONS. 37

44. Standing on the North Inch, we see the cliffof this upper alluvium sweeping along like a bound-ary wall. It can readily he traced within the town,being the cause of a steep of small extent in severalof the streets. If we now take a stand upon theupper alluvium, we shall see a similar cliff, but ofgreater height, rising behind it in the same fashion,here and there advancing into promontories, andagain receding into bays, for a considerable way tothe north. Above this cliff is a third plain, smoothand entire over all the above-mentioned promon-tories,—between these, scooped out into hollows.

TERRACES NEAR PERTH .

This third plain is of different composition; for,while Nos. 1 and 2 are almost purely of clay, No. 3contains much gravel.

45. The third terrace is first to be traced on theface of the hills a mile or two south from Perth .Behind the city, we find the Glasgow road ascend-ing its cliff. It is converted to good economic ser-