20 
rhyolites of the Blue Hills and their gradations; the mel- 
aphyr outflow and accompanying conglomerates of 
Hough’s Neck; selections from the dikes. 
6. Series of SpEciMENS from Montreal, Canada. Collected and 
exhibited by Theodore G. White. 
1. Mile-End quarries; Trenton and Chazy limestone. 
2. Corporation quarries; eleolite syenite and associated 
limestone, slates, granites and dikes. The elzolite syenite 
here cuts the Trenton limestone and is older than the 
Helderberg, because boulders of it are found in the Hel- 
derberg conglomerate. 
7. BauxirE and AssociaTED CLays from northwestern Georgia 
and northeastern Alabama with photographs of the mines. 
Exhibited by Heinrich Ries. 
This material, which is used for the manufacture of 
alum and aluminum, occurs ina belt about 40 miles long. 
Its formation is due to the action of hot springs. 
8. Dixes from Dorset Mt., Vt. Exhibited by Heinrich Ries. 
These dikes are found in the marble quarries at several 
points. 
g. VARIEGATED MarsLEs from Swanton, Vt. Exhibited by 
Heinrich Ries. 
10. A series of GNerssic Rocks and Dixkes from the Highlands. 
of Orange Co., N. Y. Exhibited by Heinrich Ries. 
The Highlands of Orange Co., N. Y., are composed 
of a series of gneisses and gneissic rocks with occasional 
interbedded limestones and deposits of magnetite. These 
rocks are cut by many dikes of diabase and diorite. They 
will be described in the report of the State Geologist for 
1895- 
11. Kaourns from North Carolina, collected by J. A. Holmes. 
Exhibited by Heinrich Ries. 
12. Porpuyritic GNeEiss and InTrusive Rocks of the Cort- 
landt series from Bedford village, Westchester Co., N. Y- 
Exhibited by L. M. Luquer and Heinrich Ries. 
