124 OUESTIONS ON THE 



281. To what does Sir Richard Phillips attribute the 

 sterility of certain countries that have been once fruitful ? 



282. Does most rain fall in mountainous countries or 

 in plains ? 



283. To what are those fertile spots called Oases, in 

 deserts, ascribed ? 



284. What are Fogs, and how are they produced ? 



285. What is Dew, and how is it produced ? 



286. In what part of England does the greatest quan- 

 tity of rain fall ? 



287. Required the annual depth of rain at London. 



288. In what part of the year does least rain fall ? 



289. At what part of the world, or within what lati- 

 tudes, does the greatest quantity of rain fall ? 



290. Are dews more copious in cloudy weather or in 

 clear weather ? 



291. What is Snow ? 



292. What is Hail ? 



293. What are Coronae, or Halos ? 



294. What are Parhelia ? 



295. What instrument has been invented and used 

 for the purpose of diverting hail stones ? 



296. What quantity of rain falls on an average 

 annually in England ? 



297. At what rate of descent do hailstones fall ? 



298. Relate some instances of extraordinary hail- 

 storms. 



299. To what cause is a Halo or Corona attributed ? 



300. How are Parhelia or Mock-suns produced ? 



301. -What are Paraselenae ? 



302. Relate some instances of the appearance of mock- 

 suns in England. 



303. What are Aeroliths ? 



304. Are fiery Meteors ever seen in England ? 



305. Relate an instance of the fatal effects of a lumi- 

 nous cloud at Java. 



306. Have aeroliths ever fallen in England ? 



307. Has there ever been an instance of the manufac- 

 ture of meteoric iron ? 



308. Are aeroliths of common or uncommon occur- 

 rence ? 



309. Describe the Aurora Borealis. 



