Strata of the Environs of St. Pelerslurgh. 323 



the numbers in the 3d column : it will be perceived however, 

 that the four last notes in the Table, viz. la, si, ut and re, being 

 octaves of the first four notes therein, viz. A, B, c, and d, the 

 numbers in the latter case, ought to have been, the exact ha:lves. 

 of those iu the former ; whereas none of them are so ; the dif- 

 ference being, in the latter case, or for d, 4*5 vibrations: which, as 

 well as the 675 vibrations assigned to g, differ so widely from 

 the system of M. Sauveur, to which the Baron says that his num- 

 bers approximate, as to divest the whole of any character for ac- 

 curacy. I have not seen the original account ; but the transla- 

 tion in a contemporary journal, introduces near the middle of 

 the Table, the note mi or e, making 630 vibrations per 1", which 

 is omitted in p. 294. 



I should be glad to hear, that one of these new Instruments 

 had been brought to this country, or rather that one had been 

 made here, with everv attention to accuracy of construction; and 

 that by means thereof, and without trusting to the fallacious use 

 of Unisons* in comparing the Notes, the numbers of Vibrations- 

 in the Scales, of several of our most approved Tuners, may be se- 

 veral times ascertained, and carefully noted for pubhcation^ in 

 yours or some other of our scientific journals. I am 



Your obedient servant, 

 Howland-street, May 3, 1 820. JoHN FareY Sen. 



111. Strata of the Environs of St. Petershurgh, in the Order of 

 Geological Position f. 



ALLUVIAL EARTHS. 



JoUPERFif.iAL deposits, either in beds, or irregularly, on the sur- 

 face of all the other formations. 



POST-DILUVIAN FORMATIONS, 

 the disposition of which did not commence, till after the final 

 retiring of the waters. 



higher than that of Instruments in England, will appear, from what Dr. 

 Robert Smith intimates, pp. 208 and 218 of the 2d Edition of his " Har- 

 monics," as to the elevation of a whole Tone, which took placx; in theEngUsh 

 Pitch, sometime previous to the middleof the last century: and from what is 

 related in corroboration thereof, by an Enj,'lish Singer, in ]). 1.'32, vol. i. of 

 the " Quarterly Musical Review," who lately took with him a standard Eng- 

 lish Tuning Fork, in his visit to the chief musical cities in Europe ; in all of 

 which, he declares the pitch to have been found by comparison, a Semitone 

 at the least lower than this Fork. 



• See the English Musical Gazette for Apiil iSlf), vol. i. pp.68 and 69. 



t From a Map Sheet, recently published by the Mineralogical Society of 

 St. Petersburgh. 



C c 2 Class 



