74 ALPINE PLANTS. 
hang over the Primula, say, 12in. above the 
plant, sloping in towards the bank, so that 
any rain falling on the latter stone will run 
off direct to the little clay pit you have 
made, and so prevent the plant from getting 
dry. It can be watered artificially in the 
same manner; the clay will hold moisture 
for a long time, and the roots of the Primula will 
soon take advantage of the moisture, and 
thus maintain themselves in the driest 
weather. 
Primula  Auricula marginata (As). 
A most valuable plant for dry fissures of 
rockwork facing south or east. Strong loam 
and limestone should be used. When 
planting in a long crevice clay should be 
used instead of loam, to wedge the plants 
tightly between the stones, starting at the 
bottom of the crevice and going upwards. 
A piece of limestone should be _ placed 
between every two plants and clay pressed 
close to the roots between the stones; thus 
it will give a beautiful effect all the year 
round. 
P. marginata and Varieties may _ be 
grown on the same principle. This plant 
