Reading the transcriptions

"- in [this] case, the semibriefe so blacke is [worth] a minime and a pricke... and the black minime a Crotchet [quarter-note] ... [= ]

"If more black semibriefes or briefes bee togither, then is there some proportion, and most commonly either tripla or hemiola,'which is nothing but a rounde common tripla"

(TM. Annotations, 4)

'Ternary measuring of the notes: of triple proportion':
     "Mit schwarzen Semibrevibus", 'with black semibreves'

(MB. ibid.)

e.g.