DISEASES SPOT AND MILDEW. 33 



prevalent on the Indian species, such as brides, Saccolabiums, 

 and the like. It is brought on by excessively forcing the plants 

 to grow, thus extending and stretching the cellular tissues, till 

 in one or more parts they rupture ; and the part so torn rots 

 and thus causes a black spot, which spreads and eventually 

 destroys the leaf, and too often all the young leaves at the top 

 of a shoot. The only remedy is to cut off all the affected leaves, 

 and place the plant in a lower and drier temperature, till fresh 

 healthy shoots and leaves are produced. It is a bad practice 

 to force young plants to grow too rapidly, for the sake of 

 qaickly making a large plant. Keeping them in a high, moist 

 temperature all the year will almost be certain to bring on this 



MILDEW also will occur, but it is brought on by a cold damp 

 atmosphere. The genus Ancectochilus is very subject to this, 

 owing to being kept under a bell-glass in winter. The stagnant 

 moist air brings on black mildew, the beautiful leaves perish, 

 and the cultivator ^asks, Why ? The reason is plain enough 

 the cold damp air has caused the mischief. The remedy is. Keep 

 the plants drier, give more air, and, when the warm long days 

 arrive, fresh shoots will spring up as healthy as could be wished 

 for. 



EXTRA POINTS OF CULTIVATION. 



Under this head I have to describe some peculiar methods of 

 growing a few species which I would not notice in the general 

 instructions before given. 



JEEIDES, SACCOLABIFM AND YANDA. These plants have no 

 pseudo-bulbs, but only a rather woody stem clothed more or less 

 densely with leaves ; and these stems generally, if not always, 

 send out strong roots. Bearing these facts in mind, the cultivator 

 will at once perceive that they require more moisture than such 

 species as have those reservoirs of life which are technically 

 named pseudo-bulbs. 



CAMAEOTIS PTJEPTJEEA. A most beautiful species, introduced 

 D 



