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When the Court has to form an opinion upon Opillions c£', a point of foreign law,.or of science or art, or as to experts identity of hand~'iting, t~e opi;1ionsupon t~at point~" ~J,l€ of. persons specIally skilled ill such forell?,n law, J--~ ~ ~- SCIenceor art, are relevant facts. . .' :E Itr~./:3(t) Such persons are called experts,. JUzes b'a t £(j'iu:,~, ,(a.) The questi0'nis, whethel~the death of A was caused by pOlson. . The opinions of experts as to-the- symptoms produced hy the poison by which A is supposed to h9.ve died, are relevant. ',' , (b.) 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 wro~g or contrary ,tolaw. . The opinions of experts upon the question whether the symp- - toms 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. ' (c.) The question is, whether a certain document, was write ten 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..