Reading the transcriptions

"Triple Proportion is, when 3 Minims ... go to the Semibrief-stroke: 2 to the Fall, and the third to the Rise of the Hand... In both Proportions, the Hand falleth in the same instant; though it rise a little sooner in the Dupla, than in the Tripla: in that [Dupla], when 1/2 in this [Tripla], when 2/3 of the time is past."

(CB.25)

'Ternary measuring of the notes: of triple proportion':
     "Mit weissen Minimis", 'with white minims'

(MB. ibid.)

'How is a Tripla recognised?'

'By the number three, which - without any distinction - is sometimes put alone, without any other sign: as "": and sometimes is put with other signs: as "" ... But this variety of signs all mean the same measure'

(CD. Bviii)