1880.] NATURAL SCIENCES OP PHILADELPHIA. 295 



TJie Northern Belt of Serpentine in Radnor Township. — Mr. 

 Ranp made the followinaj communication. 



Sometime ago, in a communication to the Academy, (Proc. Ac. 

 N. S., 1878, 402) I described a belt of serpentine in the valley of 

 the Gulf Creek, Radnor Township, Delaware Co., Pa. Recently a 

 trench for water pipe on the property of Judge Hare has enabled 

 me to procure specimens illustrating a section across the bed and 

 on both sides of it, which are presented herewith. The section is 

 on a line nearl}^ N. 75° W. The belt is probablj' not far from N. 

 70°-73° E., or about two-thirds that of the section, but this is not 

 certain. While deductions from these few specimens would not 

 be safe, 3"et the strong resemblance between the decomposed 

 gneiss of the easternmost exposure and the clearly magnesian 

 rocks 40 feet distant, points more to an alteration in place than to 

 a distinct bed. 



Garnet mistaken for Corundum. — Dr. J. M. Cardeza called 

 attention to a garnet rock at Chelsea, Delaware Co., Pa., which is 

 quarried and used as corundum. 



