1202 
6. The often appearing porphyritie structure with rounded edges, 
of the apparent feldspar phenoerists of the granites, and the highly 
undular extinctions and aggregate-polarisations of the quartz in the 
granites and hornrocks point to strong pressure in the rocks after 
they had been solidified. 
This metamorphism thus shows an entirely different character from 
that of the classic contact-zones of the type Steiger Schiefer (RoseN- 
puscH), where the sediments furnish the mineral constituents, the eruptive 
rocks heat and pressure, molecular interchanging only taking place 
in the contact-zone. It is much like the metamorphism described 
by Micner Lévy for the Plateau Central, by Barrots for Brittany, 
and by Lacrorx for the Pyrenees. The feldspathisation of the schists 
without connection with the stratified granite apophyses, and the 
manifold occurrence of tourmaline, point to the influence of mine- 
ralisators and to a supply of constituents of the granitic magma in 
the contact-zone. 
The numerous pegmatites mentioned above tend to prove that 
mineralisators have been present in the granitic magma in large 
quantities. The presence of feldspars and tourmaline as well in 
the pegmatites as in the contactmetamorphie rocks, illustrates the 
pneumatolytie character of the contact-metamorpbism. 
BRR A “TAA, 
In the Proceedings of the Meeting of September 26, 1914. 
p. 507 in the table: in the column headed 10°£/ for 237 read 244. 
the numbers of the column headed R—1 are to be provided 
with the sign —. 
April 23. 1915. 
