SCIENTIFIC READINGS. 133 



465. What was Whiston's opinion relative to the 

 formation of the earth .' 



466. What difference as to temperature is experienced 

 at the bottom of a deep mine ? 



467. If the earth \vas originally in a fluid state, how 

 may its consolidation have heen effected? 



468. How are the various strata of the earth arranged 

 and divided ? 



469. Give a description of the Primary rocks, and 

 repeat the series. 



470. Describe the nature, supposed origin, and other 

 qualities of each individual rock of the primary series. 



471. Which are the Trap rocks, and whence do they 

 receive the name ? 



47"2. Which rock takes its name from its roughness ; 

 which from its sounding noise when struck ; and which 

 from its containing almond-shape nodules of some 

 mineral 



473. Which rock is celebrated for its beautiful colum- 

 nar structure ? 



474. Required the cause and result of Volcanic action. 



475. How many active volcanoes are there, and how 

 are they situated : 



476. Describe ^Etna and Vesuvius, with their action, 

 and the results thereof. 



477- Which rocks are particularly rich in metallic 

 veins ? 



478. Why are the Primary Rucks so called? 



479. Is animal and vegetable We supposed to have 

 had au exis tence when the Primary rocks formed the 

 floor of the world ? 



480. How is the Transitive series divided, and describe 

 each group, and whence it takes its name ? 



481. What remains of animal and vegetable life are 

 found in the Transitive series ? 



482. Describe the Eadiata, and that particular one 

 the Encrinite. 



483. Give the names of the Secondary series, and de- 

 scribe each individual formation. 



484. Required the depths of the Coal strata, and how 

 they are supposed to have been formed. 



