PROCEEDINGS OP GEOLOGICAL SOCIETIES. 
207 
rock contains carbonate of lime, its structure has become sometimes 
cellular or amygdaloid. 
Rocks or strata metamorphosed by granite are not observed to con- 
tain zeolites ; as we have before remarked is the case with strata in 
contact with lava or trap-rock ; but they often contain tourmaline 
and the minerals which generally accompany tlie latter. Numerous 
minerals are developed, however, by contact with granite, especially 
when the metamorphosed rock is argillaceous. Some of the most 
frequent are mica, made, staurotide, disthene, dipyre, garnet, horn- 
blende, graphite, and spinelle. These minerals, although formed in- 
contcstably by the metamorphic action of granite, do not owe their 
existence to the immediate contact of the eruptive rock. M. Delesse 
supposes them to have been formed in a certain zone around the 
granite at the moment the granite itself became crystalline. He 
refers them to his " normal metamorphisms," which we described in 
one of our previous papers ; and he remarks that the metamorphic 
effects of granite extend to great distances, as normal metaniorphism, 
but, that, as phenomena of immediate contact, they are very much 
more limited than we have hitherto been led to suppose. 
We have thus terminated our rapid sketch of the effects produced 
on the different stratified deposits by the upheaval of igneous or 
plutonic rocks. In a future article we will glance at the other side of 
the question — the action that the different strata have exercised upon 
the rocks that have uplifted them and modified their structure and 
composition. 
PROCEEDINGS OF GEOLOGICAL SOCIETIES. 
Geological Society of London. — March 23rf, 1859. — Prof. J. Phillips, 
President, in the chair. 
The following communications were read :— 
1. "Oil some Amphibian and Reptilian Remains from South Africa and 
Australia." By Thomas H. Huxley, F.R.S., Sec. ti. S., Prof, of Natimil History, 
Government School of Mines. 
The author described in the first place the remains of a small LabjTinthodont, 
Amphibian, which lie proposed to caU Micropholis Stou-ii. The fossil was dis- 
covered by Mr. Stow, and accompanied that gentleman's paper " On some FossOs 
from South Africa," read before the Society on the 17th of November last, on 
wliich occasion Prof Huxley expressed the opmion that it would i^rove to be an 
Amphibian, and prol)ably a Labyrintliodont. 
It had been found impossible to work out the back part of the skull, so as to 
exhibit the occipital condyles, but the characters of the few cranial bones which 
remain, of the teeth, and of the lower jaw, and the traces of a largely developed 
hyoidean apparatus, afforded sutiiciently convincing evidence of the affinities of 
Micvophol is. 
The generic appellation is based on the occun-ence of numerous minute polygonal 
