Gi u 



liAli::AUS. 



or ifliiiuN, tl.i city is at once i:hrr!ke<^ 



to ra^ : 

 itivi' . iiy protbuiid, witii 



vaMi. .ilairis throug'li mv.. 



niiif'u "I- nui^.j uus usually niaiiy suc^i 

 ,-,.! ^ r,.^, .,.,-:..>.. along iti« f -  



.  : - J ::. of its frei;. . . ..... ^ , .. 



'iiminislied slope .and the 



vvithin the mc^untains) 3 a 



d opening upon the 



ftod every lon^ 



: at intervals of a, 



>va\: ui'j stream begins to 



lip its channel. The check 



dven to Hid velocity of the streat i hero is n-jarkcd, indeed, but less incisivff. 



'f the bed of the stream do; 

 y gently, and is concii . 

 re course of the stream out- 

 fi dlHtauce iaiiide the gate, 

 radually and 

 strejinl 



!>ui;iH pun 

 iti --. n> j^.iy. mere 18 no rigoreus 



than might At first lu- supposotl 

 not hav( Je at tlii* poin!. 



upward. -lo thro: 



^idn the gate jutd gtuierally i\ : 

 'Urns the veloei* 

 As the '.V  

 more of !•- -MtiM. ! I i 

 , <- ouree is bv no moans' oi . 



to 



sifting of the mate-rial in su' unne*" tha| the stones or particles at anv 



given place are of uniform size, while finer oies are carried on to be scrupu 

 lously seloot e slope and velocity |»re less. On the contrarj', all 



sorts arc -where. NeVertholjjfes there is a tendency to soj-t- 



Ilightr up liie -rJope there is a greatei-|||)W}H>rtJon of coarser deposit : 

 lower down there is a -Rj-ger prop< ' 



;> and the '; conimii 



IP the stretiui i.s piogressi^ , 



,,l>vu,n.j 'l'3t it cannot loii 



' longtime in .:., ^ .,,,.),; .,u 



)n soon becomes . lightest cau.si^ 

 id which it build .id which in turn 

 tlso abandone< >quent repetiti. 

 ouree of the strojiti -rate radially aroun- ; 

 the lapse of ag«^ it builds up a half-cone, the 

 ^ .  gular^ but >^acillat 

 long run, and aftei 



