PRÉZFACE. 
all; and very rarely even in. summer over their 
heads—in winter, all the more succulent kinds 
in their pans only. 
"Those marked F. should be placed in garden- 
frames facing the south, from about Michael- 
mas to Lady-day, defended from frosts and 
rains ; but in all fair, and not frosty weather, 
should be exposed entirely to the air. 
The G. H. kinds may be housed and unhoused 
at the same time—admitting air freely when 
Fahrenheit's thermometer is above 40, but not 
at all when under 35, or foggy. At 32 or 33 
in the open air, delay not the least to light the 
fires,——but make no more than are necessary to 
expel frost; for fire at best is insalubrious to 
plants. : 
Those marked S. are best in the Dry-stove or 
on the shelves of a Bark-stove all the year, with 
plenty of air in summer at the temperature of 
about 70, and a little occasionally even in win- 
ter when the sun shines warm, and the thermo- 
meter is not lower than 60. If the heat of the 
house descends to temperate, the plants will not 
suffer, and it is not necessary to urge it higher 
than 60 by fire, except perhaps at the eve of an 
