822 THE, JOURNAL OF (GEOLOGY. 
find rocks which are apo- but not eorhyolites. Moreover, the 
idea of time is inseparably connected with the names proposed 
by Nordenskjéld, and it is very desirable to eliminate this alto- 
gether from petrographical nomenclature. Again, unless there 
is to be a decided gain from the use of new terms, we might just 
as well continue to use the terms which have been so long in 
use, as felsite, etc., as these already imply a difference in age 
and condition of preservation. According to Miss Bascom, we 
can consistently class devitrified rocks, whether pre-Cambrian or 
recent, under aporhyolites and apobasalts, and their fresh equiv- 
alents likewise, whether pre-Cambrian or recent, under the 
accepted term rhyolite, basalt, etc. 
J. MorcGan CLEMENTS. 
MapIson, WISs., 
May 29, 1895. 
