Geology and Natural History. 63 
pus ledifolius, it appears, may form a trunk of 2 feet in diameter, 
with 160 rings. ‘The alkaline species, aquatic and meadow species, 
those of the drier valleys and foot-hills, the mountain species, &c., 
i i 30 in 
adapted for grazing otia lanata and a few other chenopo- 
diaceous plants are eaten by sheep as a substitute for gra 
r son raises the question whether—considering the 
2 ome mo 
the climatic conditions, may not be turned to some. profitable 
e 
e 
| finds that the present plants on the whole are not lacking in expan- 
Sion of foliage or succulence, at least that the more prevalent 
plants had an average of from 55 to 80 per cent of foliage or 
Working surface; and a series of rough, but seemingly well de- 
-Vised experiments demonstrated that they give off by evap- 
water is rarely t 
Make good this loss. o be 
00 feet, often not even at that depth. The 
depth of 100 to 3 
