278 Mr. Farey's Reply to Dr. Gillif. 



ing the oxalate to one uniform state of dryness. But, according 

 to the most accurate aiialyaes, 23*8 grains of dry oxalate are 

 equivalent to 20 grains of dry muriate. To avoid any error, 

 however, the oxalate was converted into carbonate of lime by 

 calcination ; and this decomposed by muriatic acid, afforded 

 19'5 grains of dry muriate of lime. 



The proportions, then, of the saline ingredients in an English 

 pint of the Pitcaithly water, are, according to this analysis. 



Muriate of soda l-?'4 grains. 



Muriate of lime 19'5 



Sulphate Of) 



Carbonate ()■.> 



3T-3" 

 To which are to be added of aerial ingredients, 



Atmospheric air . . 5 cubic inch. 

 Carbonic acid gas . . 1 cubic inch. 

 It also gives slight indications of the presence of iron ; but as 

 far as can be judged from the shade of colour produced by tinc- 

 ture of galls, the quantity is much smaller than in the Dunblane 

 water. It does not admit, therefore, of being determined with 

 much accuracy by actual experiment. 



L. A Reply to Dr. W. H. Gilby; with some addilional Facts 

 regarding the Stratification of Britain, in proof of the Fu- 

 tility and At'surdity of the Jlltempls, at applying to the same, 

 the Terms and Distinctions of the JVernerian Geognosy. 

 By Mr. John Farey, Sen. Mineral Surveyor. 



To Mr. Til loch. 



Sir, — It should not be forgotten, that Dr. Gilby, in p. 300 

 of your last volume, untrnhj charged me, with having " alluded to 

 no ivriter who had noticed the fact," of the unconformableness of 

 the Red Mail on the Coal-measures of a part of Somersetshire, 

 and, ouoting Profe'^sor Jameson's authority, for as unfoundedly 

 appropriating to himself this discovery (of near a century old), 

 took occasion, thereupon, to commence an unprovoked attack 

 upon me ; for vvhich he has not apologized in his Letter at p. 182, 

 as candour would have dictated : but seems to think it sufficient, 

 to charge on the garbled account of a brother Geognost*, the 



• Another of these crarblings of the papers in the Philosophical Trans- 

 actions, is to Le found in p. 296, of the 2(1 Edition of Williams's " Mineral 

 Kingdom," where the mention, of the Faults not being visible in tiie form of 

 *he surface of the South WalesCoal-basin, is wholly omitted !: I first learned 

 this, from p. 129 of Dr. Kidd's Geology. 



*' ignorance," 



