22 
. mal 
the well-known variability of hybrids, and as we have just remarked, the close 
relationship of those now under notice. 
Cutture. — P. Blumei, P. grandifolius and P. Wallichii are grown in the 
warm intermediate house, under the same conditions as Dendrobiums, in a 
compost chiefly consisting of fibrous loam, with a little peat and sphagnum. 
P. tuberculosus requires a warm house temperature with plenty of light and a 
humid atmosphere; it is more difficult to grow than its congeners and the 
majority of warm house Orchids. 
It is to be hoped that P. x Marthae, owing to the influence of its other 
parent, will give less trouble to growers, as one of the common effects of 
hybridisation is to produce stronger and healthier plants than the species from 
which they are derived. It frequently happens also that they produce a greater 
abundance of flowers, and this result seems to have been attained in the case 
of P. X Marthae as may be gathered from a glance at our figure. 
co 
BYU 
