184 G. W. Hawes—The Greenstones of New Hampshire. 
these rocks contains so large a proportion of alumina and also 
alkali, it will be seen how many combinations could be made 
from the same material. They both contain about two per 
cent of titanic iron and the oxygen ratio of the whole makes it 
n the metadiabase of Hanover another form was found, 
which is represented in figure 6. This is very likely a section 
of a fragment of the same species of rhizopod cut in a different 
direction. * 
These forms, distributed through the massive rock, have & 
structure, as the figures show, which cannot be attributed t0 
crystallization. They seem to make it evident that rhizopods 
must have been living over the sea bottom during the accumu 
lation of these sediments, and became buried in the mud which 
is now the material of the rock. These forms are com : of 
silicates, but of what precise kind it is difficult to determin 
since the particles are minute and their optical properties #° 
obscure. Yet upon placing a drop of acid upon one of thet — 
it effervesced for a short time, showing that carbonate of lume 
existed in it—perhaps part of that of the origival foraminiler. 
The presence of these remains of rhizopods in the me : 
* It also calls to mind the series of cells of a Bryozoan. See figures of Licker 
Pea Va acess Sem ny ot Hew fo PT 
