PREFACE, 
intense frost. When the external air declines 
to 50, it is time to light tbe fires. 
Às to shifting these plants, the larger ones re- 
quire it not oftener than once in two or three 
years ; but once or twice annually clear away the 
upper surface of their pots, and replenish it with 
fresh compost. The lesser plants must be moved 
about the end of August, or as often as their lesser 
fibres form dense mats at the bottoms and sides 
of their pots, paring off with a good knife the 
matted part, without breaking their balls of 
earth. They may be replanted either in the same, 
orlarger pots, as discretion dictates; but never 
cut away any fleshy roots, though matted, but 
give them more pot room. After shifting, wa- 
ter the new earth with a rose-pan to settle it. 
All the G. H. and F. species in summer should 
be placed on a south sheltered border, and in 
winter give the more delicate ones situations as 
"near the glass as possible. Keep the whole from 
slugs and worms. 
The Abbreviations and Classes are the same as 
in Hortus Kewensis, and similar works: but the 
genera and distribution of their species often new. 
Lirrt& CugrsgA, 
Nov. 1811. 
