348 QUESTIONS. 



in the recession of Niagara Falls ? How are rivers formed ? What 

 two things are needed to make large rivers ? 



290. When were the grand river systems of the earth formed ? 

 What is said of the alterations in the terminal moraines of the an- 

 cient glaciers ? What of the results obtained in their investigation ? 



291. What cities are built on moraines? What is the composition 

 of the Post-tertiary moraines ? What is said of the present conceal- 

 ment of their character ? What is soil ? By what agencies has it 

 been made ? What is said of their operation in the Post-tertiary pe- 

 riod? 



292. What does Hugh Miller say of the preparation of soil in Scot- 

 land in that period? 



293. What three points are worthy of remark in regard to Post- 

 tertiary animals ? What is said of the animals of England of that 

 period ? 



294. How did the Siberian mammoth differ from the elephants of 

 the present time ? 



295. Give in full what is said of the covering of the mammoth in 

 relation to the question of climate. What is said about vegetation in 

 reference to this ? What is said of the abundance of mammoths in 

 certain localities, and of the supply of ivory from their tusks ? What 

 is stated about the mammoths of this country ? 



296. Give the history of the St. Petersburg skeleton. State the 

 speculations about it, and the views of Cuvier. 



297. What is said of the mastodons ? How do their teeth differ 

 from those of the mammoth ? What is said of the Mastodon gigan- 

 teus? 



298. What is the Indian tradition about mastodons ? What is sta- 

 ted about the Newburg mastodon ? What is said of the Mylodon ? 



299. What is said of the structure of the Mylodon's skull? 



300. What is said of the Megatherium ? 



301. What of the Megalonyx? 



302. What of the Glyptodon ? What of the whales of that period ? 



303. Where have caves been found containing bones of Post-ter- 

 tiary animals ? Describe the Kirkdale cave. What was the suppo- 

 sition of some quarrymen about it? 



304. State in full the results of Dr. Buckland's examination of this 

 cave. 



CHAPTER XIX. 



305. What is said of the beginning of the age of Man ? What 

 about its conclusion ? 



306. Point out the contrast between the earth now and in the Azoic 

 age. What is said of the contrast between the present age and the 



