1816.) Humboldt’s, &c. Plants of South America. 379 
Lower Canada, Nova Scotia, Middle of France, South of Germany. 
Grebe ab be 5s 0is.5 0 wea be MO OAL. +0. 6'y eign Te 
Upsala ever ereaeveevr er ee ee 59 yl eeeeverevee 55 Ther. 
MIRGNIA, nists 919.4 .0.9:9 po oh Be Bee Cn ueistid «LOg, 
RIE Ee ose hives oe ce eeet Ee COE. a epee h OS 
Difference.,........ 13 0O S 
Labrador, South of Sweden, Courland. 
DHA, « 0:6 acc’ 0s. ta/apiwie age Oe te) On eieadel, e 
Olle.) sc bacis vee vet Zab Oe. LOPS Biv cme 
Unite” \os eevee css ore OG", Sa Bee 
Snaatekis 2... oo vet «ss ea 6S S0: a co8S 
Edjnhurgh ..005.250800)5D 57. 0054 02 FSS 
Sepckholin so sale's olsi¥.s,0,09) GO LO. oie o tag ae 
Difference.......... ll 0 9°5 
The differences in this table were determined by the method of 
interpolation. Humboldt has concluded from it, that the dif- 
ference between the mean temperature of the same latitudes in 
America and the old Continent is as follows: expressed in degrees 
of the centigrade thermometer. 
Mean Temperature, 
Latitude, Difference, 
Old Continent. | New Continent. 
0° 27°5° 7 i 0° 
20 25°4 25°4 0 
30 21°4 19°4 2 
40 17°3 1255 4:8 
50 10°3 3°3 7 
60 48 — 46 9°4 
If the mean temperature at the equator be reckoned 1, we shall 
find the half of that temperature in the old Continent at latitude 
45°; in the new Continent at latitude 39°. The difference between 
the mean temperatures in the two Continents will be better seen 
from the following table :— 
Old Continent. New Continent, 
Lat. 0° Mean Temperature 1°00 ........ 1:00 
BO ie sce dees Site ey oe ge abla dhe 0-70 
45 ener eereeeeeaenmneaeeee 0°48 int see i 0°30 
50 or eereevnenennenewreenee 0°37 eteseree 0°12 
o'3:2 
