JUNE 13, 1884.] SCIENCE. 107 
representing trees, which, if undermined as Yukon; the banks, as we saw them, being 
far as c, will generally tumble in along cd, generally about eight fect above the level of 
and carry away a couple of trees, the roots of the water. This is about the depth to which 
Le YUKO 
wert) >| 
Gs 
“SISREMICHAEL’s ISLAND 
MERMDIAN 
as 21 
Boundary Butte or. (L 
Mt. Tatotlees« 
Tatotlingu Ri 
e O 
Bello, |. Wore 
ee 
a Bere Reliance 
Zz 
2 
e] 
zZ 
2 
o 
eo 
\\2achuk Or, 
PART 2 
OF THE 
MAP OF THE ROUTE 
OF THE 
MILITARY RECONNAISSANCE 
of 1883, 
Licut. F. SCHWATKA, COMDG., 
FORT SELKIRK, B.C., TO FORT 
YUKON, ALASKA. 
SURVEYED AND COMPILED 
BY 
C. A. Homan, Topeu. ASST., U.S. A. 
GEOGRAPHICAL MILES 
10 20 30 =40 
STATUTE MILES 
30 = 40 
not more than one being able to hold it so as__ the moist ground freezes solid ; and the banks, 
to form an abatis along the bank. Fig. 11 therefore, have the tenacity of ice to support 
represents a similar sketch on this part of the them; and it is not until the water has eroded 
