450 THE ORCHID REVIEW. (May, 1913. 
position, with an abundance of moisture around them, and an average 
temperature of about 60°. These plants at the present time will be growing 
fast, and should any be in need of new rooting material they may have 
attention. Their surroundings should be kept moist, and the plants may be 
-sprayed overhead two or three times a day on favourable occasions. Even 
weak sunshine must not be allowed to reach them. They will succeed ina 
mixture of fibre and moss, in equal portions, but the stronger growers may 
have a small portion of loam fibre added. The dwarf-growing Promenzas 
are best grown in small well-drained shallow pans, which may be suspended 
over a tank or in a shady cool part of the Odontoglossum house. The 
-quaint-flowered Chondrorhyncha Chestertonii requires the same treatment 
as Zygopetalums, with which it is closely allied. 
DENDROBIUMS.—Plants of D. thyrsiflorum, densiflorum, Farmeri, 
chrysotoxum, fimbriatum, and others of the racemose section will now be 
showing their flower buds, and should be afforded slightly more water at 
the roots and a slightly warmer temperature, which will assist the expansion 
and development of their flowers. Plants of D. formosum that are pushing 
forth new roots, and are in need of new rooting material, may also have — 
attention. This plant revels in plenty of heat and light whilst in growth, 
with a long rest after flowering. D. infundibulum, Jamesianum, and other 
members of the Nigro-hirsute section succeed best grown in a cool inter- 
mediate temperature instead of a warm one. The compost advised last 
month for Dendrobiums will also answer the requirements of this section. 
SoBRALIAs and other terrestrial Orchids that are showing their flower 
spikes will benefit by an occasional watering with weak liquid manure 
water, especially if at all pot-bound. When in this state weak manure 
water is beneficial to terrestial Orchids, but to epiphytic ones, in my opinion, 
it is most harmful. 
ODONTOGLOssuMs.—Such plants as O. grande, Insleayi, Williamsianum, 
and others of this section, when their growths are fairly started and before 
they push roots, should, if necessary, be repotted. I do not recommend the 
system of top-dressing as often recommended, for if the compost 1s 
decomposed on the top that at the bottom of the receptacle is in a worse 
condition. They require a slightly higher temperature than the Cool 
house. Plants of O. Rossii and its hybrids will also require attention as 
regards repotting as they pass out of flower and their young growths get 
nicely away. They thrive grown in shallow pans suspended in a cool 
Intermediate house, in a position where they do not receive a super- 
abundance of light. O. triumphans and its numerous hybrids may also be 
repotted at this season if their growths are in the desired condition. 
Vanbas.— The present is a good time to renew the rooting material of 
any of the autumn-flowering Vandas, such as_V. ccerulea, Amesiana, 
