84 



" dried off," but their rest consists in lessening the heat and moisture, 

 though in the case of the Odontoglossums the supply must always 

 depend upon their condition. Deciduous pseudo-bulbous Orchids also 

 require a period tf rest, but water must be given in sufficient 

 quantities to prevent shrivelling. 



VENTILATING AND SHADING. In warm moist districts ventilation 

 can be given much more liberally than in cold exposed or dry 



Fig. 21. 



situations, and to these varying circumstances are due the diffe- 

 rent opinions on the advantages to be derived from free ventilation. 

 Wherever the climate is suitable and when the weather is favourable 

 there is no question that most successful results are obtained by 

 admitting air freely not only to cool-house but to tropical Orchids, 



