T'J A 1'KIMKK OF FORKSTRY. 



the hottom. the heavier pieces first. Where it falls 

 the beds of rivers are tilled up and fertile lands are 

 covered with pebbles and sand. 



For a time after such a Mood the streams are usually 

 1 >w. because the water which should have fed them 

 for weeks or months has run oil' in a few days. 'Phis 

 may be quite as serious a matter for the farmer- a- 



FK.. 1,. Plantation of Kuropean alder in the bed of a tonviit controlled by 

 dams This torrent is HOW extinct. Alps of southern France. 



the destruction of their fields, as for example in place- 

 like southern California, where the crops depend on 

 irrigation with the water of -treams which rise in 

 the mountains. Torrents have beu-un to form there in 

 the San Bernardino Mountains, and have already car- 

 ried stones and sand into the orange proves and even 

 into the town- of the San (iabriel Yallev. Me fore the 



