OF ARTS AND SCIENCES. 131 



The trip on May 1 1 was to Auburn partly in connection with 

 the class in ornithology. The rocky hill northeast of the rail- 

 road station at Massabesic was climbed and found to be well 

 worth the climb. Some peculiar examples of curved strata were 

 seen and studied for the first time. 



On May 25 an invitation from Mr. Krvine K. Brock to visit 

 and inspect his collection was accepted and a delightful after- 

 noon was spent. Mr. Brock, who spent several years in the 

 "West, had collected a large number of minerals and entertained 

 his visitors with descriptions of his specimens, mostly ores, and 

 the mode of mining and smelting. 



Hooksett Pinnacle was visited on June 8. Here is a rocky 

 prominence of milky quartz, situated on one side of the Merri- 

 mack Valley. The vein of which this is a part extends from 

 the Pinnacle in a northeasterly direction across the river, form- 

 ing the rapids at that point, cropping out once in the middle of 

 the stream and reappearing occasionally on the hills to the east. 

 Here are found quartz crystals in abundance although the lar- 

 ger crystals have been taken away. In one crevice some fine 

 pseudomorphs of quartz after calcite have been found. A good spe- 

 cimen of the latter was donated to the Institute museum in 1900, 

 by Mr. Bela H. Emerson, of Hooksett. The formation of a san- 

 dy island in the river as a result of the building of the dam at 

 Hooksett Falls is a piece of geological work of recent years. 



On June 22 carriages were taken for a drive through portions 

 of lyondonderr}^ and Auburn. The large bowlder, the largest 

 near Manchester, situated on the line between Manchester and 

 Londonderry, was visited and inspected. From there the class 

 drove to a white quartz ledge near the line between I^ondonderry 

 and Auburn, coming back by way of Rattlesnake Hill, seeing 

 some good examples of glacial polishing and scratching on a 

 ledge near the outlet of I^ake Massabesic. 



