98 H. B. Bashore — Harrisburg Terraces. 



copper as the previously described cupric salt Cs 3 Cu„Cl 7 . 2H 2 0. 

 Since the latter has a ratio that is unique among the bivalent 

 metal double halogen salts, a close structural relation between 

 the two compounds is suggested. 



These cassium-cuprous chlorides show a decided lack of con- 

 formity with Remsen's law* concerning the composition of 

 double halides. Two out of three of them fail to correspond 

 to the law, while one of these, instead of not containing more 

 than one CsCl for one CuCl, actually contains three times as 

 much caesium chloride as Remsen's law allows. 



My thanks are due to Mr. L. C. Dupee, who prepared and 

 analyzed one sample of the salt CsCu 2 Cl 3 



Sheffield Scientific School, 

 Xew Haven, Conn., September, 1S93. 



Art. XII. — The Harrisburg Terraces; by Harvey B. 

 Bashore, West Fairview, Pa. 



In 1S89 I began a study of the gravel deposits at Harris- 

 burg, Pa. ; at the suggestion of Prof. G-. F. Wright, I made 

 special effort to discover, if possible, some facts which might 

 be of value in settling the much-debated question as to the 

 origin of the deposits in this valley ; and I shall, in this paper, 

 confine myself to the statement of facts only, leaving all theo- 

 rizing to others. 



The river at this point flows between high slate hills, the 

 distance between which is generally one mile but in the neigh- 

 borhood of Harrisburg the interval is increased to a mile and 

 a half, and this additional one-half mile, on the eastern side 

 has been filled by successive deposits of gravel and clay, form- 

 ing the plane for the building of the city of Harrisburg. 



The deposit, which is about one-half a mile wide and be- 

 tween two and three miles long, consists of four terraces, dif- 

 fering somewhat in their characteristics : it is necessary, there- 

 fore, to describe each separately. The first and lowest terrace 

 is about 28 feet above low water (river 290 A. T.) : it is com- 

 posed of a fine brick-making clay and contains many bowlders 

 of large size (4-5 feet in diameter), mostly of local origin, 

 composed of sandstone and conglomerate from the mountains 

 beyond ; this deposit is distinctly marked on both sides of the 

 river and forms the gradient for the public highways : in most 

 cases, too, it is the bed of the railways up and down the river. 



*Am. Chem. Jour., si, 296; xiv, 85. 



