tone_, as being more clear
and definite. Thus _e.g._, the sentence "The two tones are a
_half-step_ apart" is much better than "The two tones are a
_half-tone_ apart."

185. A _prime_ is the relation between two tones whose pitches are
properly represented by the same degree of the staff.

A _perfect prime_ is one whose tones have the same pitch.
Middle C sounded by piano and violin at the same time would
offer an example.

An _augmented prime_ is one whose second tone is one half-step
higher than the first. Ex. C--C[sharp].

186. A _second_ is the relation between two tones whose pitches are
properly represented by adjacent degrees of the staff. (The first line
and first space are adjacent degrees, as are also the third line and
fourth space.)

A _minor second_ is one comprising one half-step. Ex. B--C.

A _major second_ is one comprising two half-steps. Ex.
B--C[sharp].

An _augmented second_ is one comprising three half-steps. Ex.
F--G[sharp].

187. A _third_ is an interval comprising two seconds.

A _diminished third_ has two minor seconds (_i.e._, two
half-steps). C--E[double-flat].

A _minor third_ has one minor and one major second (_i.e._,
three half-steps). C--E[flat].

A _major third_ has two major seconds (_i.e._, four
half-steps). C--E.

188. _A fourth_ is an interval comprising three seconds.

A _diminished fourth_ has two minor and one major second.
C[sharp]--F.

A _perfect fourth_ has one minor and two major seconds. C--F.

An _augmented fourth_ (tritone) has three major seconds.
C--F[sharp].

189. A _fifth_ is an interval comprising four seconds.

A _diminished fifth_ has two minor and two major seconds.
C--G[flat].

A _perfect fifth_ has one minor and three major seconds. C--G.

An _augmented fifth_ has four major seconds. C--G[sharp].

190. A _sixth_ is an interval comprising five seconds.

A _minor sixth_ has two minor and three major seconds.
C--A[flat].

A _major sixth_ has one minor and four major seconds. C--A.

An _augmented sixth_ has five major seconds. C--A[sharp].

191. A _seventh_ is an interval comprising six seconds.

A _diminished seventh_ has three minor and three major
seconds. C--B[double-flat].

A _minor seventh_ has two minor and four major seconds.
C--B[flat].

A