186 CARNATIONS. 
The glaffes fnould be occafionally taken 
off to admit frefti air; if this material 
point is negle&ed, the confequence will 
be a green moffy appearance on the 
furface of the earth, and an univerfal 
mouldinefs amongft the plants, which 
will deftrov them. 
«/ 
It requires more fkill to know when 
and how long the pipings (hould be 
expofed to the air, while forming root, 
than for almoft any other part of the 
management ; on this fingle point, in 
great meafure, depends the good or ill 
fuccefs of the whole undertaking. 
The propagation of Carnations by 
piping is always precarious : five thou- 
fand plants were piped one feafon, 
of which not more than one hun¬ 
dred perifhed; whereas more than two 
\ " 
thoufand were loft of the fame num¬ 
ber the year following, with but very 
little 
