338 THE JOURNAL OF BOTANY 
In most cases where these plants grow on flat- — rocks with 
lenty of room all round, the runners are very short and new 
“The area ie here two colonies of the Mountain Semper- 
near Saas Fee. For a time the plants have — quite at home, 
growing colony has become pressing. We nabs that the 
colony is no longer compact. n now 
which are 
rosette-bud or offset. The runner arises in the axil of a leaf of 
the Parent rosette. 
e notice in the photograph on Plate xxii. the crowded 
nature of the rosettes, and further that the whole colony is tilted 
upwards on its si ips face the light. For this reason, some of 
the runners appear to be shooting straight up into the air. As a 
matter of fact, this is merely due to the circumstance that the 
rosettes are tilted through a high angle and the 
rs are seen going round 
were, to another crevice to seek ‘ fresh woods and 
‘In the aT epee on Plate xxiii. a colony is seen boldly 
letting itself down over the face of the rocks from ledge to 
ledge. e runners seen on the left-hand side are obviously 
creeping or marching downhill. fe es right, the plant, by 
means of its enormous elon , has as it were made 
a ladder of itself and is dauendiig rots oe miniature precipice ” 
(pp. 100-102). 
is the only part of the book which a for criticism ; 
how to m 
The index 
it is astonishing how few folk know 
