60 THE ORCHID REVIEW. 
when grown in more warmth. O. serratum is one of these, and is 
now in flower. In growth it is very like O. macranthum, and requires 
exactly the same kind of culture, growing at the coolest part of the house. 
They succeed best in pots on the stages, and should be potted in sphagnum 
moss and fibrous peat in equal parts, and at almost any time during the 
year, when they can be caught in the right condition. This is after being 
relieved from their immensely long and exhaustive flower spikes, when they 
again commence to push up growth. When in robust health these Orchids 
are a refreshing sight to see, such fine green healthy foliage and psendo- 
bulbs do they make, and such a bristling mass of roots do they send forth. 
The treatment is exactly the same as for other cool Orchids; watering 
them with great care during the winter; letting the compost appear dry 
for several days before giving water ; and at the same time taking care not 
to get the atmosphere over moist by too frequently damping down ; which 
is a great mistake at this time of year. Once a day is quite sufficient for 
damping down, and if the plants have lately been watered it may some- 
times be advisable not to wet the floors for a day or two afterwards, until 
the plants begin to get dry again. These Oncidiums delight also in an 
abundance of air at all times when the outside weather will admit. O. 
superbiens, O. trilingue, O. lamelligerum, and O. monachicum are very 
similar in growth and general requirements. 
Keep down aphides and thrips at all costs. I find the best thing is 
Richardson’s X L. All fumigating insectide, as there is no fear of injury to 
either foliage or flowers. I use it in every house in accordance with the 
directions issued, and have not observed any bad results from its use- 
Neither the plants nor the atmosphere should be over dry when fumigating 
is intended, and once doing is generally sufficient to kill all insect life. 
Attend to the blinds for summer shading in time, so that they are 
ready for use when required. 
epi. 
ODONTOGLOSSUM CRISPUM SULFUREUM. 
FINE flower of a beautiful sulphur-yellow variety of Odontoglossum 
crispum has been sent from the collection of R. Brooman White, Esq., of 
Arddarroch, which is well described by the above name. It measures 25 
inches in diameter across the toothed petals, which, as well as the sepals, 
are very broad, giving the flower a very full and round appearance. The 
colour is bright sulphur-yellow, a little darker round the margin of the petals 
and on the lip. It is without any trace of spots, and is a very charming 
form. Another form, quite similar as to colour, but with much narrower 
segments, is also enclosed, and a flower of O. Pescatorei with a few small 
Violet spots on the petals. 
