236 
from cold climates. The apple-tree from Siberia* 
where the short summer of three months immedi- 
ately succeeds the long winter, in England, usually 
puts forth its blossoms in the first year of its trans- 
plantation, on the appearance of mild weather ; 
and is often destroyed by the late frosts of the 
spring. 
It is not difficult to explain this principle so in- 
timately connected with the healthy or diseased 
state of plants. The organization of the germ, 
whether in seeds or buds, must be different, ac- 
cording as more or less heat or alternations of 
heat and cold have affected it during its formation ; 
and the nature of its expansion must depend 
wholly on this organization. In a changeable cli- 
mate the formations will have been interrupted, 
and in different successive layers. In an equal 
temperature they will have been uniform ; and the 
operation of new and sudden causes will of course 
be severely felt. 
The disposition of trees, may, however, be 
changed gradually in many instances ; and the 
operation of a new climate in this way be made 
supportable. The myrtle, a native of the south 
of Europe, inevitably dies if exposed in the early 
state of its growth to the frosts of our winter ; but 
if kept in a green-house during the cold season for 
successive years, and gradually exposed to low 
temperatures, it will, in an advanced stage of 
growth, resist even a very severe cold. And in 
the south and west of England the myrtle flou- 
rishes, produces blossoms and seeds, in conse- 
quence of this process, as an unprotected standard 
