t 75 ] ■ . 
As the tipper minims are fixths to thofe next tinder 
them, it follows, from the law of harmonic founds, that 
the lower minims are fifths to the fundamental founds 
of thefe pipes, which are written in quavers, to fhew that 
they are very difficult to be produced. The upper mi- 
nims of N° I. a. 3. 4. 5. and alfo of 10. are fharp thirds, 
or rather, major tenths, to the fundamental found of 
each pipe. And the upper minims of N° 6. 7 . 8. and 9. 
are nearly minor tenths to their fundamentals ; which 
circumftance feems to agree with what I remarked in 
the fmaller fyflem, as an extraordinary property, touch- 
ing the minor thirds. t But I will not yet aflert, that 
this property is altogether natural, becaufe I found fome 
of thefe latter pipes were partly ohflrudted by accidental 
rubbifh, which was drawn out with difficulty ; fo that I 
pretend not to decide, whether the caufe of their be- 
ing, not quite, in the fame proportion of tune^ as I found 
in the firfi: fyftem, arifes from fome cafual injury, or from 
original intention, or original inaccuracy. X i have 
faid, the upper minims of N° 6. 7. 8. and 9. are nearly 
minor tenths to their fundamentals ; becaufe, in fa6t, I 
found them fomething more than minor ^ and yet not 
major \ wherefore I have ufed the mark (^), of a triple 
crofs, to fignify fomething more than (»^), the double 
crofs ; and the mark of ( x ), a lingle crofs, to fignify a 
diejis^ or fomething lefs than («), the double crofs ; which 
laft, in the modern pra6lice of mufic, always means to • 
fay, plus a /emit one ^ neither more or lefs. For though 
i" and % referred to from the following pgge, 
h ^ 
the 
