The decision of the appeal must depend on what inferences should properly be drawn from the meagre evidence presented by the parties. There is no question of credibility because the appellant in evidence agreed that the account of the conversations given by the respondent was substantially correct. The document signed by the appellant on 14 February 1982 was an acknowledgement that the appellant was indebted to the respondent in the amount of $48,296.71. The matter thus acknowledged was entirely within the knowledge of the appellant, who said in evidence that it was not a mistake that he had signed in his own name and that he had done so deliberately. The document is strong, although not conclusive, evidence of the existence of the debt on which the respondent sued. The appellant's evidence that he signed the document because the respondent needed it is equivocal. On the one hand, it may mean that the appellant, out of friendship, signed a document which he knew to be false, for the purpose of assisting the respondent to mislead the bank. That is not a view which should readily be accepted when neither party has alleged fraud against the other. On the other hand, it may mean that the appellant, knowing that the respondent's position vis-à-vis the bank would be strengthened if the money due for the excess stock was owed by the appellant personally to the respondent personally, agreed to assume a personal liability. That interpretation of the evidence is open, and is supported by the fact that no reply was sent by the appellant to the letter dated 20 July 1982 from the respondent's solicitors. The failure to answer a letter may amount to an admission if there are circumstances which render it more reasonably probable that a man who denied the assertions made against him in the letter would answer those assertions than that he would not: see Wiedemann v. Walpole [1] ; Young v. Tibbits [2] ; and Lustre Hosiery Ltd. v. York [3] . The letter of 20 July 1982 was written by a solicitor; it enclosed a copy of the acknowledgement executed on 14 February 1982 and threatened the institution of proceedings unless payment was made within seven days. It would have been easy enough for the appellant to have stated that the acknowledgement of his liability did not represent the true facts, if that had been the case, and it is unlikely that he would have allowed the solicitor's assertions to pass unchallenged if they had been erroneous. The appellant's failure to reply to the solicitor's letter is therefore an admission - although perhaps not in itself strong evidence - of its correctness. The evidence of the subsequent payment of $1,000 and the receipt given for it points in both directions, as Samuels J.A. said in the Court of Appeal, and does not seem to advance the case one way or the other. Finally, the specific defence pleaded was not that the respondent was not owed the debt, but that the debt was owed by the purchaser company. However, if the respondent is personally entitled to payment that must be because of an agreement evidenced by the document of 14 February 1982, and under that agreement the appellant was the person liable to pay. Little, if any, weight should however be placed on the form of the defence.