4 davon kommen in derselben je einmal vor und sind in beiden Merkmalen constant; die Formen AB, ab gleichen den Stammarten, die beiden anderen stellen die ausserdem noch möglichen constanten Combinationen zwischen den verbundenen Merkmalen A, a, B, b vor.
Four of these appear once each in the series and are constant in both traits; the forms AB, ab resemble the parent-species, the other two represent the constant combinations between the conjoined traits A, a, B, b that are possible in addition.

constant = constant See p. 5, s. 5.

forms = Formen See p. 3, s. 8.

parent-species = Stammarten See p. 5, s. 10.

conjoined = verbunden Sherwood have “associated”, we follow Bateson. Verbunden derives from the verb verbinden; see p. 10, s. 14.

combinations = Combinationen See p. 21, s. 2.

possible in addition = ausserdem noch möglichen These “constant combinations” are Ab and aB. Bateson messes this up by translating “which combinations are likewise possibly constant”.