NovEMBER, 1923.] THE ORCHID REVIEW. 343 
seen to be pushing from the base of the sheaths. C. Lawrenceana makes 
its growth during the winter months, and is in consequence a difficult plant 
to cultivate successfully for many years. It should be grown in the 
warmest part of the Cattleya house and placed near to the roof-glass, so 
that it may obtain plenty of light. The compost should be allowed to’ 
become quite dry between each application of water, when it should be 
poured around the outer edges of the compost. From now onwards discretion 
should be exercised in applying water to the roots of the Cattleya genus, 
for it is better to keep the plants on the dry side than to allow the soil to 
become saturated. 
CYPRIPEDIUM CONCOLOR, C. NIVEUM, C. GODEFROY&, C. BELLATULUM, 
and many of the hybrids of these plants should receive very careful 
treatment during the dull winter months. Having thick fleshy leaves, the 
plants do not require so much moisture at the roots as other Cypripediums, 
the compost should be allowed to become dry before water is applied, when 
the receptacle may be immersed nearly to the rim, or the water poured: 
around the outer edges of the soil, the object being to prevent moisture 
lodging in the axils of the leaves. In removing the flower scapes, cut thenr 
clean to the base. 
PLANTS OF ODONTOGLOSSUM CITROSMUM that are nearing the com- 
pletion of their season’s growth should be suspended or staged near to the 
roof-glass in an intermediate temperature. The supply of water at the 
roots should be reduced gradually, until after the new pseudo-bulbs are 
thoroughly developed, when moisture should be withheld for longer periods, 
affording only sufficient to keep them rigid. This treatment should be 
continued through the winter months, and until the flower spikes are seen 
to be pushing from the centre of the young growths. Odontoglossum 
grande and O. Schlieperianum that have passed out of bloom should be 
placed on a shelf near the glass in the cool house and rested. O. Insleayi 
and its variety Leopardinum are producing their flower spikes and should 
be liberally supplied with water until after the flowers fade, when they 
should be rested. 
ZYGOPETALUM.—The partially developed pseudo-bulbs of Zygopetalum 
Mackayi are sending out flower spikes, and from now onwards until the 
flowering season is over extra care must be taken in watering the roots, for 
an excess of moisture may cause the leaves to become spctted. Water 
should only be applied when the compost is dry, sufficient to soak the 
materials thoroughly being applied. The compost should be allowed to 
become dry before affording moisture again. Z. Crinitum, Z. Clayiand others 
of this type together with Z. Perrenoudii, should be afforded similar 
treatment until the growth of the new pseudo-bulbs is completed. All these 
plants thrive best in a moist shady position in the intermediate house. Ge 
