2. When it is necessary in the course of a cause to inquire into the nature of a particular act, or the intention of the person who did the act, proof of what the person said at the time of doing it, is admissible evidence, as part of the res gesta, for the purpose of showing its true character. On an indictment for a rape, for example, what the girl said so recently after the fact as to exclude the possibility of practising on her, has been held to be admissible evidence, as a part of the transaction. East, P. C. 414; 2 Stark. Cas. 241; 1 Stark. Ev. 47; 1 Phil. Ev. 218: Bouv. Inst. Index, h. t.