Ivfr. Farey's Accouni of the Valleys, (^c. in Derbyshire. 253 



mon Reficclina Circle ; tVie angle being first lakcn on une 

 side of the paranelisni of the glasses, and then on the olhtr; 

 so that (he angle is doubled, then it is repeated on a fresh 

 part of tlie circle, as many times as the observer thinks pro- 

 per, and the product divided by the number of observations 

 taken ; tlie mode of taking these observanons is explained 

 at full in Dr. Hees's Cyelopaiclia, and in Dr. Mackay's pub- 

 lication on the means of findiny; the lonsiiude. 



XXXVII. Further Extracts from the first Foh/me <f the 

 Report to the Board of Agriculture on Derbyshire. By 

 Mr. John Fauev Sen., giving an Account cf tkc princi- 

 pal narrow Rocky Vallevs, of the Strata inteisected 

 and exposed by their Excavations, and in the -moit noted 

 Cliffs, Cavekns, c^c. therein : of the Cliffs in the wider 

 Valleys, and of the modern Slips'o?- Sliding of Tracts of 

 argillaceous Strata in their Sides, &c, 



J. HE Rocky parts of Derbyshire and its environs furnish 

 numerous instances of narrow Valleys, or Dales <; Combes), 

 with precipitous and rocky sides, otien exhibiting very fine 

 Rock Scenerv, which, as objects of curiosity and interest 

 to the Traveller, seem to require some notice in this place : 

 and beine; able to mention the most striking particulars, 

 relating" to the straiificalion of each of such Valleys, the 

 foliowuior list will, 1 hope, interest the Miner and the Geo- 

 lotri.^t, as pointing outjhe best situations for examining and 

 comparintf the edges of corresponding strata, on the two 

 sides of a vallev, the ledges of Rock in its bottom, and of 

 studying the truly surprising:; and powerful causes which 

 have operated, in the excavation of such Valleys; a subject 

 uhich will be further elncid.ited, by the account of the beds 

 of the diflertnt Rivers*, in Section VI. of this Chapter. 



An Alphabetical List of the Names of the principal nan-oiv 

 ajtd Rocky Valleys, or Defile<, with precipitous Cliffs, 

 in and near to Derbyshire, describing their Situations, the 

 Strata exlnbited in their Sides and Bottoms, and the 

 Names of the most voted RocivS,'Cavehns, <^c. in each. 



Barbrook Dale, NE of Baslow, about -3- m. long, E of Dcr- 

 vieut Hiver, in a KE direction ; Chtfs and loose blocks 

 of 1st Grit Rock, a lead Cupola, slag-mill and Sulphur 

 work in it. • 



• [This account will be found in my last Number p. 192. — Edjtop ] 



Ra' Bues- 



