A Week 2 Glaciers. 291 
g the increase in the frequency 
uch greater than natural, and in- 
creases as you ascend higher points of the mountain, I 
at symptoms mentioned by tourists, of 
difficult and laborious respiration, that is, during rest or repose, 
but even at this point, I found that the muscles became rapidly 
fatigued, and while in motion the respiration was accelerated, 
and consequently more or less difficult, but ceased to be oppres- 
sive after a. few moments of rest, proving that the effect was due 
_ hot to — of the air, but the exercise in this rare atmos- 
latter per minute.* Notwith 
durance is diminished almost to zero. 'The moment however, 
you place yourself in the horizontal position, by lying on the 
snow, the muscles being at rest, you feel merely lassitude, but no 
fatigue, which returns almost immediately, on the muscles being 
again called into action. 'The most troublesome and annoying 
circumstance was the intense thirst, produced in part by the cuta- 
neous transpiration, which was very abundant, in consequence of 
the fatigue produced by motion, and also by the peculiar condition 
ofthe atmosphere. As this thirst increases, the desire for food di- 
minishes, until it becomes actually a loathing. This was expe- 
rienced not only by myself, but to a great degree even by the 
guides, who at the Grand Mulets devoured the fattest kind “= 
roasted and boiled meats with the greatest gow, but at the Grand 
Plateau cared for nothing more than the wing of a chicken, re- 
fusing positively the hearty meats, but swallowed with infinite 
satisfaction the Bordeaux wine which I had carried for my own 
use. The only beverage that had an agreeable taste to me, and 
which alleviated my thirst, was the lemonade gazeuse. ‘Taking 
asmall quantity of snow in my hand, I would saturate it with 
this liquid, and then allow it to dissolve in my mout 
My two friends and myself chose the highest point of the Grand 
Mulets as our resting place for the night ; but owing to its steep- 
hess, fearing lest we might, during sound sleep subsequent to the 
fatigue of the day, roll or slide down its side, we constructed with 
the loose stones from the crevices of the rock, a wall about ten 
feet long, and about two feet high in the centre, and descending 
to one foot at its extremities, of a semilunar form, against which 
We were to place our feet. The larger stones were now removed, 
