Terms

G.T.P.F.

 G.T.P.F.
 
subsequently four others, namely, G.T.P.F. were devised, and then
the letters were reduced to a new system, all of cognate sound
being placed next to one another, as being of the same family in
respect of vocalization." 2

According to other authorities, the four were b. ff. g. d.,
which would be more in unison with the theory which
represents the harder ones as primitives.
http://gray.ischool.berkeley.edu:1935/books/txt/cambrianjournpt204cambuoft_djvu.txt
Back