"... it may often be the case that it becomes apparent to a defendant that some of his evidence is not being well received by a particular juror or jurors and I do not consider that what I have heard takes the position anywhere near the point where I need, in the interests of justice, discharge a juror who there is no reason whatever to suppose will not be true to her oath and decide the question of his guilt or innocence according to the overall weight of the evidence once properly directed by me as to the law."