In casethere is not sufficient space on this card to record all desirabledata with respect to 'Floral' and 'Faunal Changes,' these notesare continued by the use of index letters onto an 'extension card'as indicated in Fig. 1, cards 1 and
The method by which Felger links notes on one card in his database to other cards.
In this system I use three distinct types of cards, each 3 in. X5 in. and of 'medium weight,' which, for convenience of referencehere, I shall designate 'condition card' (Fig. 1, card 1), 'barredcard' (Fig. 2, card 1), and 'extension card' (Fig. 1, card 2; Fig.2, card 2). The cards for these plates were not selected withreference to contemporaneity, which I hope will not confuse, butselected with a view to illustrating to better advantage the plan ofamplifying notes on the 'extension cards.'