ROYAL INSTITUTION—MAY 18
... AvorL INSTITUTION-Afr 18a of 'L SR LDAVY-S FOURTis LECTcUa ON 62oLOt1, p ?? - ' ?? ?? ?? ' 7 0! f :tit In te foregoing lctures on Geoiogy, the obect-b'aa been, 'se Zto-pint outr the aspects by w~hich frock6 inay 'be dlstinuuished- £Fronieach other. It has bees} shewss, thxat thteire appearanc~e0, . zocwxtsanilfng-their irregi~ariy, bear a constant-relation ~to -tic their irnteiior coiscruction ...