As materials, 122 novels of series ``Onihei Hankatyoo'' by Ikenami Syootaroo, in Bunsyun Libray (18 vols. published already) were taken, since a lot in the Edo Period. The result obtained from a random sample of 24 works amounted to 3.518+1.504% with confidence probability 0.95, therefore it can not be said that occurrences of the subjects are negligible as exceptional events. Numbers of such imperatives per work follows approximately to Polya-Eggenberger distribution. The 122 examples of such kind found in the whole 122 works are listed up at the end of this paper. If the notion of ``zero case-marker'' was accepted, then some ten examples could be added besides, though they were omitted in this survey for the sake of clearness. Notice that 35 examples have their subjects of the third person.

In addition, vocatives appended to imperatives are not to be interpreted as semantic substitutes for subjects. An evidence of inadequacy of such interpretaion is given from the statistical point of view.

Examples are classified by their grammatical forms into three groups: The subject is represented by (1) [noun phrase] ga (22 examples), (2) [noun phrase] wa (73 examples), or (3) [noun phrase] mo (27 examples).

As a rule, the first form is exerted in the case to choose the person(s) to obey the order among people possible to do so. The second form is exerted in the case to specify the very person referred to by the subject to do a certain act, mostly in contrast with (an)other person(s) to be requested some different act(s), especially to assign him/her/them some task. The third form is exerted in the case that, at the stage someone does, did or is going to do an act, the addressee(s) is/are also to be asked to do the same (sort of) act.