84 
WILLIAM SMITH : HIS MAPS AND MEMOIRS 
LECTURE V. 
" Variations from the General Regularity of Strata. — 
Isolated Masses, attentuation and discontinuity of Strata ; remark- 
able elevations and depressions ; unconformity of course and 
declination, and apparent dislocations of Strata. — Dykes and 
Mineral Veins. Illustrated by sections and drawings. 
LECTURE VI. 
" Geology of Yorkshire. — Exemplifications of tbe great 
principles of the Science, around the coast and tlirougli the interior 
of the county. — Enumeration and description of the Yorkshire 
Strata, with their included organised Fossils and other peculiarities. 
— Instances of elevations and depressions, and other conformities 
of the Strata, illustrated by Maps, Sections, and Drawings. 
LECTURE VII. 
" On the Practical Advantages of Geology, and its 
beneficial application to Agriculture, Mining, Coalworking, and 
Commerce in Yorkshire. — Valuable products of Yorkshire : Build- 
ing Stone, Paving Stone, Slates, Marbles, Bricks, Pottery, Casting 
Sand, Grindstones, etc. — Sites of population and Manufacture. — 
Discovery and working of Coal and Minerals. 
LECTURE VIII. 
" Review of the subject, with reflections on the Formation 
OF THE Strata. — Proved to have been deposited from water 
liable to occasional agitation. — Change of chmate considered. — 
Consolidation of Strata. — Effects of the Deluge in detaching 
fragments from the rocks, rounding them by attrition in water, 
and scattering them over other Strata at great distances. — Bones 
of land animals found in this gravel, and in Limestone Caves. — 
Account of the Caves of Kirkdale, of Oreston, etc. — Antediluvian 
inhabitants of the earth. — Conclusion." 
Of these lectures Phillips says* : ''A certain abstractedness of 
mind, generated by long and soUtary meditation, a habit of following 
out his own thoughts into new trains of research, even while engaged in 
* Ice. cit., p. 109. 
