396 J. Eiighis on the New South Shetlands. 
Clusters of these columns are occasionally seen reposing on 
their side in such a manner as to exhibit the surfaces of their 
divided by regular fissures into large rhombic tables, many of 
which appear to have recently fallen out, and now lie scattered 
fragments of rock, whose principal ingredient appears to be green 
aspec 
A being much softer in its nature than the basalt and 
more affected by decomposing agents, the number of fragments 
are consequently greater in proportion, and much more finely 
