121 
indeed, when the amateur is made fully aware of how many 
dainties and gratifications, he could procure, by a systematic use 
of these protectors, and at so very moderate an expense, com- 
pared with the expensive structures we sometimes meet with, 
his protectors would be in constant occupation, and we will 
engage that it would be most difficult to find a spare corner in 
them. 
Bottom Heat for Deciduous Shrubs. Of course we do 
not presume to say that the very same amount of bottom heat 
is equally suitable to all the shrubs, that may find a place here, 
from whatever clime. Nevertheless, we know, by experience, 
that a medium point, a kind of compromise between the 
extremes, will, under judicious management, lead to general 
success. For shrubs, in the opaque protectors, during the 
first stages, from 65 to 70 degrees w ill be iirojier ; when they 
are beginning to expand their leaves, and are removed to the 
glazed protector, an advance of 5 degrees may be allowed. We 
may here advise about the atmospheric temperature also, which 
must, in all cases, bear some relation to the amount of bottom 
heat; and this should beat least 10 degrees lower than the 
bottom heat in the opaque, and about 5 degrees average in the 
glazed, accelerator. 
Let it, however, be observed, that it is not proper to adhere 
to so precise an amount on all occasions ; bottom heat has 
other relations besides those which relate to the root action. 
Nature has so established the order of affairs, that solar light is 
the cause of a much increased amount o( atmospheric warmth; 
and what takes place out of doors, must be imitated within. 
When, therefore, what in termed fair weather prevails, which in 
general, is only another form of expression, for more solar light, 
the temperature must be supposed to rise in due proportion; 
remembering one thing, that as a plant in a pot has not the 
liberty to range for food, that the same has in a state of nature, 
such is not equally able to bear extremes of temperature; too 
copious and too sudden a perspiration is frequently prejudicial. 
Under general circumstances, an advance of five degrees above 
ordinary atmospheric heat, may be permitted. For these shrubs 
a very moderate amount of ventilation will suffice : when, how- 
ever, they come into leaf, there must be a progressive increase, 
in order to facilitate the necessary elaborations. 
301. auctakium. 
