C 272 ] 
being an Interval equal to a Tone Major , and an en- 
harmonic Piejis, 
The third Species is the Chromaticum Tonixum . 
Its component Intervals are, a Semitone Major, fuc- 
ceeded by another Semitone Major > and, laftly, the 
Complement of thefe two to the fourth, commonly 
called a fuperfluous Tone. 
The fourth Species is the Chromaticum Sefqui- 
alterum , which is conftituted by the Progreffion of 
a Semitone Major , a Semitone Minor, and a Third 
Minor . This is mentioned by Ptolemy , as the Chro- 
matic of Pidymus. Examples among the Moderns 
are frequent. 
The fifth Species is the Chromaticum molle . Its 
Intervals are two fubfequent Semitones Minor , and 
the Complements of thefe two to the fourth $ that 
is, an Interval compounded of a Third Minor , and 
an enharmonic Diejis. This Species I never met with 
among the Moderns. 
The fixth and laft Species is the enharmonic . Sali- 
nas and others have determined this accurately. Its 
Intervals are, the Semitone Minor , the enharmonica , 
Piefis and the Third Major . 
Examples of four of thefe Species may be found 
in modern Practice. ButI do not know of any Theo- 
rift who ever yet determined what the Chromaticum 
Toriueum of the Ancients was : Nor have any of them 
perceived the Analogy between the Chromaticum Sef- 
quialterum and our modern Chromatic . The Enhar- 
monic , fo much admired by the Ancients, has been lit- 
tle in Ufe among our Muficiansas yet. As to the P)ia- 
tonicum intenfum , it is too obvious to be miftaken. 
6 Arijloxenus 
