*Complete Dissociation.*--Here are included reactions which appear to be entirely unrelated to the corresponding stimulus words; in the case of such reactions the stimulus words seem to act, as Aschaffenburg has pointed out, merely as signals for discharge. This subdivision contains several types of reactions which seem to be dependent upon the phenomenon of perseveration; it contains also the rather important type of neologisms. The phenomenon of *preservation* occurs in cases in which one may observe an abnormal immobility of attention. To react normally to a series of stimulus words requires on the part of the subject, in the first place, a certain alertness in order that he may grasp quickly and clearly the meaning of each word, and, in the second place, a prompt shifting of the mind from one reaction to the next. When such mental mobility is lacking the subject is liable to react not by a response adjusted to the stimulus word, but either by repeating a previous stimulus or reaction, or by giving a word associated to the preceding stimulus or reaction. The names of the different types of reactions included under the heading of perseveration are sufficiently descriptive; we shall here refer only to those which require further definition. *Association to Preceding Stimulus.*--Here is placed any reaction that is shown by the frequency tables to be related to the stimulus preceding the one in question. Seeming or even obvious relationship, if not established by reference to the frequency tables, is disregarded. In the tables, however, the combination may not exist in direct order but only in reverse order, in which case the reaction is included here. The following examples may serve as illustrations: _thief--night_ _lion--pocket-book_ _Lion--pocket-book_ is not found in the frequency tables, and is, therefore, an individual reaction; _thief--pocket-book_, however, is found there; _pocket-book_ is, therefore, classed in this case as an association to preceding stimulus. _table--fork_ _dark--mutton_ _Dark--mutton_ is not found in the frequency tables; _table--mutton_ is also not found there in the direct order, but is found in the reverse order, viz.: _mutton--table; mutton_ is, therefore, classed in this case as an association to preceding stimulus. *Association to Preceding Reaction.*--If either the reaction in question or the preceding reaction happens to be one of the stimulus words in our list, and a relationship between the two be found to exist by reference to the frequency tables--whether in direct or in reverse order--the reaction in question is classed as an association to preceding reaction. This is illustrated by the following examples: _eating--table_ _mountain--floor_ _Mountain--floor_ is an individual reaction; _table--floor_ is found in the frequency tables; _floor_ is, therefore, classed as an association to preceding reaction. _beautiful--flowers_ _window--red_