106 
NAT. ORDER. — ROSACEA. 
obtaining a fine blow of roses in the depth of winter by the most 
expensive artifices ; and yet fine flowers may be produced early in 
the spring by any ordinary stove, put in operation in December. 
When the plants are first introduced, keep the air of the house 
about 55°, never letting it fluctuate to more than two or three degrees 
below the above. In the second week aim at 60° as the standard ; 
in the third week 65°. When a month has nearly elapsed, begin to 
increase the heat gradually to 70° : having brought it to this stand- 
ard, let it afterwards exceed it from three to five degrees, rather than 
sink below. A succession may be kept up by introducing some pots 
every eight or ten days. 
Insects. All the species of Rosa are very liable to the attacks of 
insects, especially of the aphides : some, particularly the Briar and 
Scotch Rose, are attacked by the cynips rosce, which, by puncturing 
the bark, occasions the production of rose-galls, and of those massy 
tufts often seen on wild roses, which were formerly known under the 
name of bedequar, and used in medicine. A great number of insects 
seem fond of the flowers of roses, from the earwig to the seemingly 
harmless lady-bird, which deposits its larvse in the leaves of various 
species, both wild and cultivated. There seems no remedy for in- 
sects on plants in the open air so simple and effectual as gathering 
them by hand, or removing the leaf on that part of the shoot which 
is infected by them. Under cover, tobacco smoke will prove an ef- 
fectual remedy for the aphides ; but the larvae of many others, and 
especially of the tipula and the tenthredinidse, which occasion the 
wrapping up and shrivelling of the leaves, can only be removed by 
hand. 
Medical Properties and Uses. See Rosa centifolia, Vol. t, p. 6 ; 
or Rosa Canina, p. 88 of this volume. 
