Resistance of Liquids to Solid Bodies moving in them. 231 
deadly pale; our eyes sunk in their orbits, and our lips were of a 
livid blue. When we rested on the rocks, with our hands above 
our heads, or lay down on the sand, with our eyes shut, our mouths 
open, and without masks, we looked like so many dead bodies. 
Although aware of this beforehand, I experienced a very disagreea- 
ble sensation when closely looking at one of my companions. 
At the Pico del Fraile we saw, as last year, a crow; and when 
we had reached the summit, we saw two of those birds flying at two 
hundred feet below us. As far up as the Pico, which is the boun- 
dary of the perpetual snow, under the stones which have preserved 
some moisture, are to be found a species of large woodlice, nearly 
in a torpid state. ‘They are the last living things we met with on 
the ground. 
We are not the first persons who have reached the top of the 
volcano. Many attempts have been made, which have failed from 
different causes. When arrived at a certain height, some travellers 
have been seized with a vomiting of blood, which compelled them 
to abandon their enterprise. In 1825, and in 1830, some English- 
men reached the crater. Mr. Glennie (William) was the first, I be- 
lieve, who reached it. He gave a plain straightforward account of 
what he had seen; but a friend of the marvellous got hold of it, to 
enlarge upon and publish in the Mexican journals. Mention is 
therein made of columns, of porticos, of Chinese bridges of ice, of 
which we saw nothing, and of continual eruptions, none of which 
took place before us. 
Arr. IIJ.—On the Resistance of Liquids to Solid Bodies moving 
im them; by A. Bourne. 
Tuts is an interesting subject of inquiry, and that branch of it 
which relates to the greatest practical velocity of boats and vessels, 
appears to be of great importance. Circumstances have occurred, 
within a few years, which have invested this subject with novelty 
and interest, sufficient to engage the attention of scientific men, and 
rouse them from the apathy which generally attends the investiga- 
tions of physical facts and relations, which were supposed to have 
been well ascertained. It has been observed, when a boat mo- 
ved in a canal at the common velocities of three, four, or five miles 
an hour, that a wave preceded her, and greatly retarded her mo- 
