Baohe.] 5U [ May 1 5 ) 



is also exposed between the road and the railroad for 10 feet more, making 

 t lie bed at least 45 feet broad; the highest point of rock exposed is 15 

 feet above the level of the county road. 



The dip of the feldspar bed is northward (40°) beneath the gneiss. 



The direction of the feldspar bed does not conform to the strike of the 

 bells of gneiss, but, on the contrary, is transverse, i. e., nearly north and 

 south. 



The feldspar is orthoclase, of light pink color, with an occasional 

 streak of white granular quartz running through it. Some of the large 

 masses quarried out contain considerable quartz. Large masses of bio- 

 tite mica are occasionally met with in quarrying ; but the occurrence of 

 biotite is not general through the rock. 



The quarry was opened in the summer of 1886, and about 30 tons taken 

 out and sold to the potteries at Trenton, etc. It is the only feldspar 

 quarry in Montgomery county. The quarry in Delaware county is 

 described in the Annual Report of the Geological Survey of Pennsylvania 

 for 1886. A few others, in the States of Delaware, New York, Connec- 

 ticut, Massachusetts and Maine furnish all the feldspar manufactured 

 into pottery in the United States, the total production from all the quarries, 

 from 1882 to 1887, having been 14,000 ; 14,100 ; 10,900 ; 13,600 ; 14,900 ; 

 10,200 tons, valued respectively at 870,000; $71,112; $55,112; $68,000; 

 $74,500; $56,100. The crude feldspar is valued at the Trenton potteries 

 at about $5 the long ton ; and the pulverized feldspar at $11 ; the quartz 

 being carefully separated out. 



A Fragment of Objectionable University-Extension Teaching. 



By R. Meade Bache. 



(Read before the American Philosophical Society, May 15, 1S91.) 



It need hardly be said, and yet, to obviate the possibility of 

 misinterpretation in outside quarters of that which I am about 

 to remark, it becomes necessar}^ formally to declare that I have 

 no intention to depreciate the cause represented by the well-con- 

 certed effort of Universit} r -Extension teaching to disseminate 

 knowledge heretofore confined to the comparatively few. I could 

 heartily wish that nry theme admitted of no mention save of 

 generalities, but thus treated it would not subserve the interest 

 which I would gladly promote, by being brought home to the 



