( *74 ] 
out fufficient Reafon. But Mr. Huygens, having 
more accurately examined the Matter, found it to he 
the beft Temperature that could be contrived. Tho' 
neither this great Mathematician, nor Zarlino, Sati- 
nas, nor even Don Vincentino , feem to have had a 
difiintt Notion of all thefe thirty-one Intervals, nor 
of their Names, nor of their Necellify to the Per- 
fection of Mu fie. 
I muft obferve to you, that I received, fome time 
ago, a Manufcript from Florence , where a Mufician 
of that City had rightly named thefe Intervals of the 
Octave. I found their Names, you know, many 
Years ago. 
In Huygens ' s Temperature the Tones are all equal: 
But, in a true and accurate Practice of Singing, they 
are not fa. And I muft add, that the Tone divided 
in every Species muft be the Tone Minor y for the 
Divifion of the Tone Major is harfh and inelegant. 
So that, in the Divifion of the fourth, it is to be ob- 
ferved, that in every Species, the Tone Major muft 
either be an undivided Interval, or make Part of one. 
You may perhaps wonder how the foregoing Doc- 
trine can be found in the Writings of the Ancients, 
fince the Diftinction of Tones into Major and Minor 
is no where mention’d in their Writings. But it- is 
to be obferved, that though the Terms do not occur, 
yet the Thing itfelf was not unknown to them. I 
own, they have not expreffed themfelves fully 5 yet, 
from the Whole of their Writings come to our Hands, 
1 think the Doctrine before laid down may be well 
Supported. But, as it would require fome time to 
put this in a juft Light, I muft defer it to another 
Opportunity. 
I am, &c. 
IV. 
