ORCHID TREATMENT DURING GROWTH. "Zij 



growth, especially as regards the East Indian Orchids, such 

 as A'erides, Saccolahium, Vanda, Plialanopsis, Dendrohnim, 

 and many others requiring a high temperature, with a con- 

 siderable degree of moisture. 



The Brazilian Orchids, most of which come from a cooler 

 climate than the foregoing, and one not so highly saturated 

 with vapour, of course require less heat and less moisture, 

 hut these should also have a considerable degree of warmth 

 during their growing season ; consequently the houses which 

 arc devoted to the Brazilian plants and to some of those from 

 Mexico, should be artificially heated to about 60° by night, 

 and from 65"^ to 70'^ by day ; and as the days lengthen the 

 temperature may be allowed to increase, so that during the 

 months of May, June, July, and August the night heat may 

 range from 05° to 70°, and by day from 70° to 85°. 



Of late years we have had so many additions to what are 

 called Cool-house Orchids, that it is quite necessary there 

 should be added another house specially for their cultivation, 

 and which we may call the New Grenadan and Peruvian house. 

 A plan of such a house will be found at page 59. This will 

 accommodate a great number of plants from various high 

 mountain districts, which may be grown together under the 

 same treatment. We do not recommend ordinary greenhouses 

 for Orchids, for our belief is, that very few Orchid growers 

 will long uphold that treatment ; and although we are told by 

 collectors that many of the species of epiphytal Orchids are 

 found in localities where the temperature falls so low at times 

 that the plants are frequently covered with hoar frost, we do 

 not think it expedient to subject them to such cool treatment 

 in this country. The house we recommend for the Odonto- 

 r/lossums and other genera and species that come from similar 

 regions, and, consequently, require the same treatment, is 

 precisely the same as others, only it must be kept at a lower 



