four o'clock
`` Well , his opinion on the signatures may be valuable , though as a rule experts differ so absolutely that their evidence is always taken with considerable doubt , but it is part of his business to look out for erasures and alterations . It is quite possible Brander may have removed that blot , and that he has done it so well that neither you nor I could detect it ; but whether he did it with a knife or chemicals you may be sure that Cooper will be able to spot it , whichever he used . I have very little doubt that your suspicions are correct and those parchments were really the pretended mortgage deeds . If you like I will go round and see Cooper at once and arrange for him to meet us in Coleman Street to-morrow at four o'clock . '' `` Thank you very much . The idea of the blot being erased had never struck me . '' The next day Cuthbert met James Harford and Mr. Cooper at the door of the accountants , and after being introduced by the clerk to the expert they went up together .