Editorial Correspondence. 97 
and Mount St. Elias. 
Br. carbonif. sandstones. 
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— 
From ec point about fifty miles it is 
ined by the Porcupine river, and 
a ae traversed its entire course, 
first trip ever made from Fort You- 
kon het B. ae to the mouth of 
the ri escri 
/&@ meeting about 375 miles from Fort 
= Youkon, the Tanand river from 
= the southeast, and at the bend the 
in a south (slightly easterly) direc- 
tion 450 miles, meeting the Takite- 
sea, in a northwest direction, about 
* 250 flea terminating in a tremen- 
dous delta, nearly as large as that 
of the Ganges. I have obtained 
specimens of rock aad fossils suffi- 
cient to prove the ages of the stra- 
ta, but a very few wo serve 
for a general description. 
The ann agrams, though 
having no pretensions to accuracy 
in detail, ig give you some idea 
of the ro 
Sta: af03- ae Fort Youkon and 
stream, we have on 
Blue slates and sandstones. 
(Sea.) Ciaran ALES 
River to Sea 40 miles below the first bend. 
