AND OF TENEHIFFE. 
Kortli 
latitude. 
Lowest height 
at which 
snow falls. 
Inferior limit 
of the 
perpetual snows. 
Difference of the 
two pre- 
ceding columns. 
Mean 
temperature. 
Toises. 
Metres. 
Toises. 
Metres. 
Toises. 
Metres. 
Cent. 
Rcaum. 
0° 
2040 
39;6 
2460 
4794 
420 
ac 
QO 
27° 
21-6° 
20° 
1550 
3020 
2360 
4598 
810 
1578 
24'5° 
19-6° 
40° 
"i 
1540 
3001 
1540 
3001 
17° 
13-6° 
This table presents only the ordinary state of nature that 
is to say, the phenomena as they are annually observed 
Exceptions founded on particular local circumstances, exist 
1 mis it sometimes snows, though seldom, at Naples, at Lisbon 
and even at Malaga, consequently as low as the 37th degree’ 
0 as we have just observed, snow has been 
heen to fall at Mexico, the elevation of which is 1173 toises 
a love the level of the ocean. This phenomenon, which had 
not been seen for several centuries, took place on the day 
mat the Jesuits were expelled, and was attributed by the 
people to that act of severity. A more striking exception 
was found in the climate of Valladolid, the capital of the 
province of Mechoacan. According to my measures, the 
height of this town, situate in latitude 19° 1.2' is 0 nlv a 
thousand totses: and yet, a few -years before our arrival in 
■New Spain, the streets were covered with snow for some 
flo L u-i s lre S . 
it dcsWn/l ;ir;r rp : lr ? ot sntt ‘ er the snow; but 
it destioj ed all the vines m the open air. This observation 
is interesting to vcgetable physiology. In hot countries, the 
plants are so vigorous, that cold is less injurious to them, 
the* Arh.,f,«n bU -f r imp .°v ed , b y M ‘ Broussomwt, is very different from 
belong. ToUorth Amcri^‘ h Wl “ Ch * haS ° Cen COnfoUI ' dt ' d ' but w,dcl * 
