CULTURE. 5 
well; but there are perforated pots, made specially for 
the purpose, which we much prefer for some kinds, such 
as Dendrobiums, Aérides, &c., because they allow a greater 
amount of air to circulate amongst the roots, keeping 
the compost sweet and clean. Some object to these 
pots on account of the shelter they afford to insects 
and other vermin that prey upon the roots of Orchids; 
but this is a minor evil, and may be readily overcome with 
a little extra vigilance. 
Temperatures. 
To enable readers to understand what is meant by such 
terms as stove, intermediate, greenhouse, or cool-house, 
when used in giving directions for treatment, the tem- 
peratures for each are tabulated here: 
SuMMER. WINTER. 
Day. | Night. | Day Night. 
deg. | deg. || deg | deg 
_ Stove 75 65-70 | 65 60 
Intermediate or Cattleya house 70 60 | 55-60 55 
Greenhouse or cool-house . 60 55 55 50 
It is not always possible, nor yet desirable, to follow 
these figures exactly, as, for instance, in very hot weather, 
the stove will sometimes run up to 8o0deg. or 85deg., and 
the cool-house cannot be got below 7odeg. With care, 
however, these temperatures do no harm. 
Shading. 
During four or five months of the year—from April to 
August—the shading of Orchid-houses is a matter of great 
importance. There are very few Orchids indeed that 
