Section 45

The question is whether the death of A was caused by poison.

The opinions of experts as to the symptoms produced by the poison by which A is supposed to have died are relevant.

The question is whether A, at the time of doing a certain act, was, by reason of unsoundness of mind, incapable of knowing the nature of the act or that he was doing what was either wrong or contrary to law.

The opinions of experts upon the question whether symptoms exhibited by A commonly show unsoundness of mind, and whether such unsoundness of mind usually renders persons incapable of knowing the nature of the acts which they do or of knowing that what they do is either wrong or contrary to law, are relevant.

The question is whether a certain document was written by A. Another document is produced which is proved or admitted to have been written by A.

The opinions of experts on the question whether the two documents were written by the same person or by different persons are relevant.

Facts bearing upon opinions of experts