CHAPTER 11. 
PRELIMINARY GEOLOGY. 
Course of inquiry as to Geological Truths. Early Observers. 
Modern Methods. First Results. Proofs of Succession in 
Strata. Non-fossiliferous Rocks. Silurian. Devonian. Car¬ 
boniferous Strata. New Red Sandstone. Lias and Oolites. 
Green Sand and Chalk. London Clay. Sands and Gravels. 
Meaning of Succession of Deposits. Summary. 
Why not indulge such thoughts as swell our hearts 
AVith fuller admiration of that power, 
AVho gives our hearts with such high thoughts to swell ? 
Why not indulge in his augmented praise ? 
Darts not his glory a still brighter ray 
The less is left to chaos, and the realms 
Of hideous night, where fancy strays aghast; 
And, though most talkative, makes no report ?” — Young. 
The history of science shews that philoso¬ 
phers have been more commonly found 
trying their powers at the circumference of 
the circle of human knowledge, than culti¬ 
vating the space within; like birds in 
