"Now, it is a well-established rule in our criminal law that you do not prove one crime by proving another or by leading evidence tending to show that another crime has been committed. That is a good general rule. But then, when you are dealing with this class of crime there is some relaxation of the rule, otherwise you might never be able to bring the crime home at all. Let me give you an illustration that is not at all unfamiliar - there are many cases of it, especially in our large cities - you get a degraded man who finds some little girl in the street, and he gives her a penny, and gets her to go up a close, and there he does something immoral with her, and then he sends her away. Nobody sees what he has done; there is only the evidence of the child. And then the same thing happens with another child, and again nobody sees that; and then there is a third child, and the same thing happens again. Well, of course, if you had to have two witnesses to every one of these acts - they are all separate crimes - you would never prove anything at all. But that is not the law. The law is this, that, when you find the man doing the same kind of criminal thing in the same kind of way towards two or more people, you may be entitled to say that the man is pursuing a course of criminal conduct, and you may take the evidence on one charge as evidence on another. That is a very sound rule, because a great many scoundrels would get off altogether if we had not some such rule in our law. Now, I give you this direction in law. If the conduct which is the subject of these charges is similar in character and circumstances, and substantially coincident in time, and you believe the evidence of both these girls, then the evidence of the one may be taken as corroboration of the evidence of the other. This is in substance what was laid down in the High Court in the case of Moorov v HM Advocate (1930) JC 68. That was a case where an employer in a Glasgow warehouse used to take one girl employee at a time up to his private office, and there commit an act of indecency, and then she was put out of the door. Nobody saw the act of indecency committed. There was only the girl's word for it. And then he would get another girl to go up, and the same thing would happen. Again nobody else was there, and there was just the girl's word for it. Now, no doubt there were in that case a number of these criminal assaults committed upon separate girls, whereas in this case we are only dealing with two, but I do not hesitate to tell you - and I take the responsibility of telling you - that if you believe the evidence of these two girls whom you have seen in the witness-box, and accept it as the evidence of reliable witnesses, you may take the one as corroborating the other, and therefore, as against the accused on each charge."