In Baker v. Borello (1902) 136 Cal. 160, the California Supreme Court approved an instruction which told the jurors to deliberate in light of their knowledge on the subject. " Jurors, in weighing evidence, always exercise their judgment in the light of their own general knowledge of the subject in hand, whether instructed to do so or not; and a judgment will not be reversed whether they are or are not so instructed." ( Id. at p. 167.)