Wright.] 52 [December 20, 



N. H. Again, west of the railroad, a mile south of, and also near, 

 Berry Station, the phenomenon is well marked. The region be- 

 tween Salem, N. H., and Derry has not, however, been thoroughly 

 investigated. Following the stream down from Derry Station, on 

 the Manchester and Lawrence Railroad, to West Windham Station* 

 on the Portsmouth and Nashua Railroad, the ridges are tolerably 

 well developed for nearly the whole distance, especially near Mr. 

 Campbell's, in Londonderry. That seems to be an unusual diverg- 

 ence from the ordinary course, and perhaps is unconnected with 

 the main series. Again, the development is unmistakable for a 

 mile or more near Wilson's Crossing, five miles from Manchester, 

 on the Manchester and Lawrence Railroad. Mr. Warren Upham 

 writes me that " an important series is plainly continuous from Lou- 

 don, along Suncook River to its mouth; thence along the west side 

 of Merrimack River to a point opposite the south part of the city of 

 Manchester, a distance of twenty miles." Mr. Upham's " opinion [of 

 this series] is, that if farther traceable it would be along the Merri- 

 mack Valley to Nashua and southward," there being some remains 

 of such a series visible four miles south of that place. I hope the 

 region from Wilson's Crossing northward will be more fully explored ; 

 as it is not at all improbable that the series I have described will con- 

 nect itself with that coming down from Loudon, making a line sixty 

 miles long. I have been so often told that the ridge ended in a 

 swamp about forty rods farther on, that I have become quite scep- 

 tical of negative testimony. 



A year ago, in a paper read before the Essex Institute of Salem, 

 I solicited information concerning any similar ridges in the vicinity. 

 Rev. J. H. Fitts, of Topsfield, and Hon. Gyles Merrill, of North 

 Haverhill-, informed me of their existence in those towns. Largely 

 through the assistance of these two gentlemen I have followed a 

 series altogether like the one described, and running nearly parallel 

 with it, and about seven miles distant, from a point one mile and a 

 half north of Beverly Cove through Wenham, past the Gov. Brad- 

 street house in Topsfield, through the eastern part of Boxford (a 

 branch seeming to come down from each side of Bald Pate Hill in 

 Georgetown, one of which crosses the road between Georgetown and 

 West Boxford, about two miles west of the former place), thence 

 northwards to Groveland Station. Here the ridge continues across 

 the broad intervale almost to the very bank of the Merrimack. On 

 the opposite side of the river the ridge passes in a most singular man- 







