7 It is convenient to deal, at the outset, with the second ground. The invoices totalling $75,569.77 were admitted in evidence at the trial. Nothing was said as to the basis on which the invoices were admitted. The trial Judge noted in his reasons that "the invoices were admitted in evidence without qualification". I shall assume in favour of the appellant that the invoices were admitted as truth of their contents. The invoices, however, even when assumed to have been admitted on this basis, do not establish the reasonableness of the amount claimed by the respondent. That is because, as counsel for the respondent correctly conceded, the invoices contained insufficient information as to the nature and detail of the work done for the amount claimed in each particular invoice, the time spent by the respondent in carrying out the work, the rates charged by the respondent for particular items of work, the materials used and the cost of the materials. While some of the invoices did contain some particulars as to these matters, the detail was quite inadequate to prove the respondent's claim. Thus, even if everything written in the invoices were taken to be true, that did not establish the reasonableness of the amount charged by the respondent for the work carried out by it.