(sea 5 798 
as low as even 55.4° in 12° 2' south latitude. With this exception, there 
is little difference in the temperature of the soniein hemisphere us low as 
34° south latitude, either in New Holland, Africa merica. ‘I'he mean 
temperature of Port Jackson, in 33° 51 south an has been ascertained 
5.62; of tap ves ape of Good Hope, in 33° 55' south latitude, to be 
66.8° ; and of Buenos Ayres, in 34° 36’ south latitude, to be 67.6 Ip the. 
pel hemisphere "ae meail ede in latitude 34°, is 67.8°. 
extremely probable that, as far as the parallel of 57° south latitude, the 
differences in the temperature, of the two hemispheres are greater in. the 
summer. than, the winter. ‘Vhe cold of the Falldand islands, in latitude 
514° south, is less than that of London in the same. latitude to the north. 
iS 
The arborescent ferns and Naar gh pee are often injured by the cold | 
in Van Diemau’s island, aptude 42° south ; and in the southern part of” 
New Zealand, latitude ey south, Cook et in latitude 439-449 south, «* 
in July in the middle of Wrigs, that the thermometer a n00R was usually 
between 46° and 51°.* . At Rome, latitude 41° 53’ north, the thermoime- 
ter at noon in January rarely reaches 519-5: oh in Paris the mean noon 
day temperature of January is, according to 33.7° r this reason 
it is supposed that the ule as a Cather fenunters does not differ 
from that of, the n orth so. muc the greater coldness of the winters 
as of the s os Mets ne e Hea boldt, the greatest heat in the 
vaatiels of 48°. and 58° of m4 hadstitte does not exceed 43.7°-46.8° ; 
while at St. Petersburgh and Umea, in 59° 66’ and 63° 50’ north la ti- 
tude, it is 65.2° and 62.6°. In the Straits oF Dlcecilon we 53° at 
54° south iatitudi snow falls He nee daily in the middle of summer ; and, i 
d 
‘ 
the same place, in the le of December, the sun not settin g or 
eighteen hours. to refers Krusenstern observed that the thermometer never 
rose higher than 52° ; while,on the contrary, Von Buch remarked it as high 
as 79.4° in Lapland under the parallel of 70°. _ In 60° south latitude, which 
‘ = 
t 
isphere, Cook and Forster found the temperature at midsummer not 
higher than 36°; and icicles were continually forming. on their ship. 
Even in the extreme points of Lapland, in 70° north stan hg the pines pe 
the height of sixty feet; while at the Straits of Magellan and in Statio 
island, near New Year's harbor, in latitude 55° south, nothing like a tres 
is found, except scrubby birches aid Winteree. 
Viewing the distribution of. plants with respect to longitude, we find. . 
that, while he great forms of vegetation are wholly controlled by cir- 
cumstances attendant upon the parallels of latitude, there are wide. ah 
fere rences, of a “secondary. nature, which cortespond in some with the ] 
i 
i 
beyond the h mits. of part Hictiat districts » to which they give Neate! . 
features. Thus, in North America, on the east of the Rocky Mountains, 
azaleas, rhododendrons, magnolias, vacciniums, act@as. an 
the. rincipal features of the landscape; while, on the western side of 
the dividing ridge, these genera almost entirely disappear, and no Jonger 
constitute a striking characteristic of the vegetation, The genera of Pro- 
teacewe and the Ericee, at the Cape of Good Hope, are replaced in New 
Holland by different genera of Proteacex, and by Epacridee; while 
neither the one nor the 
other. exist on the continent of South Am merica, » : 
of Bromeliacee - 
with the re some Rhopalas. The natural order 
‘and, will best 
4 St 
* Aicther ‘tuadrmesion of my opinion that the Phormium or > flax li of New y Po ie 
best succeed in tropical Florida _— lily . 
tos. 
