_Hu_. Series. Im. Rec. Two Days. Im. Rec. Two Days. N. O. N. O. V. M. V. M. A^{1-4} 6 7 0 1 5 6(1) 0 2 A^{5-8} 5(2) 7 1(2) 1 7 7 1 0 A^{9-12} 6(1) 7 2 2 6 7 0 5 A^{13-16} 4(1) 4(1) 0 2 5 5 0 1 Total. 21(4) 25(1) 3(2) 6 23 25(1) 1 8 Per cent. 95 100 14 24 88 100 4 32 These results will be included in the discussion of the results of the _B_ set. THE _B_ SET. A new material was needed for foreign symbols. After considerable experimentation nonsense words were found to be the best adapted for our purpose. The reasons for this are their regularly varying length and their comparative freedom from indirect associations. An objection to using nonsense syllables in any work dealing with the permanence of memory is their sameness. On this account they are not remembered long. To secure a longer retention of the material, nonsense words were devised in substantially the same manner as that in which Müller and Schumann made nonsense syllables, except that these varied regularly in length from four to six letters. Thus the number of letters, not the number of syllables was the criterion of variation, though of course irregular variation in the number of syllables was a necessary consequence. When the nonsense words were used it was found that far fewer indirect associations occurred than with nonsense syllables. By indirect association I mean the association of a foreign symbol and its word by means of a third term suggested to the subject by either of the others and connected at least in _his_ experience with both. Usually this third term is a word phonetically similar to the foreign symbol and ideationally suggestive of the word to be associated. It is a very common form of mnemonic in language material. The following are examples: cax, stone (Caxton); teg, bib (get bib); laj, girl (large girl); xug, pond (noise heard from a pond); gan, mud (gander mud). For both of these reasons nonsense words were the material used as foreign symbols in the _B_ set. The nonsense words were composed in the following manner. From a box containing four of each of the vowels and two of each of the consonants the letters were chosen by chance for a four-letter, a five-letter, and a six-letter word in turn. The letters were then returned to the box, mixed, and three more words were composed. At the completion of a set of twelve any which were not readily pronounceable or were words or noticeably suggested words were rejected and others composed in their places.