VOL. XXIV.] PHILOSOPHICAL TRANSACTIONS. 243 



Mineralia quadam^ Conchy Ha petrifacta, et alia Fossilia ^ BeroHna a Clariss. 

 Christian. Maximiliano Spenero, Doct. Med. ^c. N° 302, p. 2082. 



A mere catalogue of 32 specimens of petrified shells and other fossils. 

 De Piscibus, Moluscis et Crustaceis Philippensibus^ Ex MSS. R. P. Geo. Jos. 



Camelli ad D. Jacobum Petiver, S.R.S. transmissis. N° 302, p. 2085.* 



Little more than a mere catalogue of certain fishes, molusca and Crustacea, 

 found on the shores of the Philippine isles. 



Epistola Firi Reverendi D, Georgii Hickes,'jf S. T. P. ad D. Hans Sloane, M. D, 

 et S. R. S. De varia lectione Inscriptionis, quce in Statua Tagis exaratur, per 

 quatuor Alphab^ta Hetrusca. N° 302, p. 2076.* 

 A letter on the various reading of an inscription found on the statue of Tages, 



by four Hetruscan alphabets. 



The Theory of Music reduced to Arithmetical and Geometrical Proportions, By 

 the Rev. Mr. Thomas Salmon. N° 302, p. 2072.* 



Having had the honour last week of making a musical experiment before the 

 society at Gresham College, it may be necessary to give a further account of it; 

 that the theory of music, which is but little known in this age, and the prac- 

 tice of it, which is arrived at a very great excellency, may be fixed on the sure 

 foundations of mathematical certainty. The propositions, on which the expe- 

 riment was admitted, were : that music consisted in proportions, and the more 

 exact the proportions, the better the music ; that the proportions offered were 

 the same that the ancient Grecians used; that the series of notes and half notes 

 were the same as our modern music aimed at, which was there exhibited on 

 finger-boards calculated in mathematical proportion. This was demonstrated 

 upon a viol, because the strings were of the greatest length, and the proportions 

 more easily discerned; but may be accomodated to any instrument, by such 

 mechanical contrivances as shall yield those sounds, which the music requires. 



To prove the foregoing propositions, two viols were mathematically set out, 

 with a particular fret for each string, that every stop might be in a perfect ex- 

 actness: on these, a sonata was performed by those eminent violists, Mr. Fre- 



• A strange irregularity in the pages of the original of this part appears, as in the titles of the papers 

 in this page, and in several other places. But it was thought best not to correct them, otherwise the 

 facility of referring to the Original would be obviated. 



f A learned divine and antiquary of the 18th century. He died in 1715, aged 73. Besides hii 

 theological works, he wrote Institutioneg Grammaticae Anglo-Saxonica, et Antiqua Litteratura 

 Septentrionalis. 



; I I 2 



