may be; and not only this, but that these same twenty-five cards suffice for the successive computation of all the Numbers from
, to
, inclusive. With respect to the number of Variable-cards, it will be remembered, from the explanations in previous Notes, that an average of three such cards to each operation (not however to each Operation-card) is the estimate. According to this the computation of
will require twenty-seven Variable-cards;
forty-two such cards;
