June, 1916.) THE ORCHID REVIEW. 155 
foliage is frequently the result of over-watering before the plants have 
become well rooted. Watering with cold water, strong doses of liquid 
manure, draughts, and other things are also liable to cause this dreaded 
disease. 
CypripEDIuMS.—Such plants as C. Lawrenceanum, Stonei, Curtisii, 
Rothschildianum, C. Maudiz, and others which delight in the heat of the 
warmest house should have immediate attention, if increased root space is 
necessary. The same applies to those of the Selenipedium section, where 
they are grown. The whole of these plants thrive in the same potting 
material as the cooler section, which was potted earlier in the season. 
Besides these mentioned, those of the C. bellatulum and C. niveum section, 
that have recently flowered, with their hybrids, should be repotted if 
necessary. Well-rooted specimens in good material, with room to develop, 
should not be disturbed. 
Many succeed in growing these plants in compost in which loam 
preponderates, but I find they thrive quite satisfactorily in a compost made 
up of two parts of peat fibre, one loam fibre, and one sphagnum moss, with 
some small pieces of mortar rubble added. The plants must be potted 
rather firmly, and should be grown well elevated up to the glass in a 
warm Intermediate house. To those entrusted with the potting of the 
different plants, the firmness of the compost is an interesting study, and 
one which should receive attention. This section of Cypripediums require 
careful watering at all seasons. 
Oncip1um Papitio.—This, and the allied QO. Kramerianum, and O. 
Sanderz are most beautiful species, and, owing to the shape of their flowers, 
are sometimes called Butterfly Orchids. They flower during the summer 
months, and, although only producing one bloom at a time, they are pro- 
duced in succession during the season, and when in bloom are always 
interesting. Too frequent flowering weakens the plants, therefore it is 
advisable to remove the old spikes from time to time, to allow fresh and 
vigorous ones to form. These plants thrive under the warmest conditions, 
and should be grown in small pans or baskets in a clean open compost. 
MILTONIA VEXILLARIA.—Towards the end of the month, in many 
collections, plants of this species, and its spring flowering varieties, will 
have passed their flowering stage, and should be allowed to enter upon a 
short period of rest. Immediately the spikes are removed the plants should 
be taken to a cool, shady position in the Intermediate or Cool house. 
Although never absolutely at a standstill as regards growth, nothing should 
now be done to induce it. For some few weeks it will only be necessary to 
keep the compost moist, but on no account must the plants be allowed to 
suffer for want of. moisture, either at the roots or in the atmosphere. In 
cold localities the cool Intermediate house is the most suitable at this 
