Jan. 1827. MOUN'T SARMIENTO. 25 
and excellent is his description. It is also mentioned in the 
account of Cordova’s voyage.* The peculiar shape of its 
summit as seen from the north would suggest the probability 
of its being a volcano, but we never observed any indication of 
its activity. Its volcanic form is perhaps accidental, for, seen 
from the westward, its summit no longer resembles a crater. 
From the geological character of the surrounding rocks its for- 
mation would seem to be of slate. It is in a range of mountains 
rising generally two or three thousand feet abows the sea; but 
at ‘die N.E. end of the range are some, at least four thousand feet 
high. The height of the “Snowy Volcano,” or as we have called 
it, Mount Sarmiento, was found, by trigonometrical measure- 
ment, to be six thousand eight hundred feet} above the level 
* Ultimo Viage, p. 120. 
+ From an attentive perusal of the voyage of Magalhaens, I have lately 
been led to think that this is the mountain which Magalhaens called 
Roldan’s Bell. Sarmiento has, however, assigned that name to a moun- 
tain at the back of his Bay of Campana, which will be noticed in it’s 
proper place. The name of Mount Sarmiento was too long, and too well 
established with us, or I should have restored the name bestowed upon it 
by Magalhaens. Herrera, in his Descripcion de las Indias Occidentales, 
cap. xxill, notices the “Campana de Roldan” as a great mountain in 
the midst of the entrance of a channel; they gave it this name (Cam- 
pana de Roldan) because one of Magalhaens’s companions, named Roldan, 
an artillery officer, went toexamine it. ‘ Y la Campana de Roldan una 
Pefia grande en medio al principio de un canal: dieron le este nombre 
porque la fué a reconocer uno delos compaiieros de Magallanes Hamado 
Roldan que era artillero.” 
¢ By angular measurement, with a theodolite, from the tent, 
the base being by diff. of lat. 297,863 feet, and allow- 
ing 7, of the intercepted are for terrestrial refraction .. 6,864 feet. 
By angular measure with sextant (index error, dip, and 4, 
of the intercepted arc being allowed) the base being 
AO HO ALEO EE ix c)s ayseje «ie tcionajoueteoite Sena Coco ode dana Waeey 
By angular measurement, with a theodolite, from Warp 
Bay, by Lieuts. Skyring and Graves ........+.....-- 6,800 
Mean......-. 6,967 feet, 
but as the last observation, from the angle of elevation being greater, was 
more likely to be correct, 6,800 feet is considered to be its elevation. 
