Hence it follows, that all variety of climates may 
exist even in the same latitude, merely by means of 
the altitude of the place ; and consequently, all var- 
ieties of vegetable habitat. This was found, by 
Tournefort, to be literally the case, during his travels 
in Asia. At the foot of mount Ararat he met with 
plants peculiar to Armenia ; above these he met with 
plants which are found also in France ; at a still 
greater height he found himself surrounded with such 
as grow in Sweden; and at the summit, with such as 
vegetate in the polar regions. 
Every one is aware that it has been found impos- 
sible to acclimate the great portion of vegetables in 
this country, which are natives of much warmer 
parts of the globe, where uninfluenced by extreme al- 
titude. Hence the necessity of the green-house and 
the stove, to provide for them an atmosphere conge- 
nial to their habits. But it is not so generally ima- 
gined, that vegetables derived from regions much 
colder than our own, require considerable care in 
their management. It is, however, a fact well known 
to the admirers of alpine plants, that many of them 
are exceedingly difficult of culture. It is far more 
easy to imitate the climate of the torrid, than the 
frigid zone. 
In their native situations, alpine plants live, during 
their short summer, in a thin, cool, and pure air; 
during winter, under a perpetual mantle of snow. 
We, consequently, should yield them shade in the 
summer, from the heat of the sun ; and a covering in 
winter from the severity of frosts. Unless this be 
attended to by the cultivator of alpine beauties, he 
will not be crowned with success. 
Hort. Kew. 2, v. 4, 91. 
