xviii 
PREFACE. 
All the larger species thrive very well in almost 
any situation, yet seem to prefer moisture, cool- 
ness, and moderate shade; and to look neat, re- 
quire transplanting and dividing at least once in 
every two or three years. "The middle-sized spe- 
cies will also thrive in shady borders (but not 
overshadowed by trees) of very light vegetable . 
earth, especially such boggy earth as Rhododen- 
drons and Heaths delight in; in such situations 
they require dividing and transplanting at least 
once in every year. 
The remaining small and minute species will 
scarcely thrive out of small pots of bog earth ànd 
lóam, and are best sheltered in a frame during the 
winter, from excess of wet and frost; but at all 
other times they require to be constantly exposed 
to the air, and should be carefully divided and 
transplanted every spring and autumn into fresh 
earth. "These pots in summer should have the 
morniug sun only for a few hours, in autumn rather 
more, and in the middle of winter an aspect to the 
south; but stil] with the lights of the frame con- 
stantly down in all but very wet or hard frosty 
Weathér; and even then they may be exposed, if 
the sun shines strongly : for nothing is more pre- 
judicial than foreing their natural forwardness pre- 
pacem into blossom. 
