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later miocene age. Strangely enough ZrrKet came over to this 
country to study our British Eruptives, while Jupp went into 
Hungary to examine the Igneous rocks in that country of the 
same age. ‘Their published descriptions are of rare interest 
and value to Petrologists, and should be carefully read. 
Von Haver’s map of the Geology of Hungary, to demonstrate 
the eruptions over the ancient Schemnitz region, and a large 
collection of Igneous rocks from the Himalayan range, were 
displayed, but a scanty modicum of time could be afforded for 
examination, as members had to hurry off to catch their trains. 
Annexed hereto I append Zrrxex’s tabular arrangement of 
the Igneous rocks, as drawn up by Dr. Suyruz, with a view of 
assisting workers who may not have at command the original 
to consult. 
FERDINAND ZIRKEL’s arrangement of the Felspar bearing Igneous Rocks, 
with the Geological age of their outflow, tabulated. 1876. 
I ORTHOCLASE ROCKS. 
(1) QUARTZOSE or WITH EXCESS OF sI6 
Ante Tertiary Tertiary and post Tertiary equivalents 
(A) CRYSTALLINE (A) CRYSTALLINE. 
Granite ... ose ote ae Rhyolite (Liparite) 
Granite-porphyrites 
Felspar-porphyrites (B) GLASSY or semivitreous 
Obsidian 
Pearlite 
Pumice 
Pitchstone 
(2) QUARTZLESS WITH PLAGIOCLASE. 
Syenite ... nee se See Trachyte 
Augite-syenite ... nee ae Augite-trachyte 
Quartzless orthoclase-porphyries 
(3) QUARTZLESS WITH NEPHELINE OR LEUCITE. 
Foyaite ... = ras aa | Phonolite 
-Miascite . eas ox Leucite 
Lichenerite “Ee AS bi | Sanidine 
Orthoclase- bonsiny bie’ 
