2. The years of income to which the assessments relate ended on 30th June in each of the years 1950, 1951, 1952, 1953, 1954, 1955 and 1956. Throughout the first six of these years the partnership had no clerical employees. Mr. Brice concerned himself with the manufacturing side of the business, including some purchasing of materials, and the appellant did the clerical work. This, however, did not include the writing-up of the books of account, which was attended to by a firm of chartered accountants called D.S. and R.M. Martin. The particular employee of that firm who dealt with the partnership's books was a man named Davison. In general, accounts from suppliers of materials were paid by means of cheques drawn on the partnership bank account, the cheques being filled out and signed by the appellant. His practice was to note on the butt of each cheque the date, the name of the payee or the purpose of the payment or both, and the amount. About twice a month Davison was given the cheque book and other materials from which the books were to be written up. He entered in a cash payments journal the payments shown on the cheque butts, showing in respect of each cheque the date, the name of the payee, the serial number of the cheque, the amount, and, by the use of appropriately headed columns, the general nature of the expenditure. One column was headed "Purchases", and in it were shown all purchases of materials for use in the manufacturing processes of the business. Once this book had been written up, no further reference was made to the cheque butts, either by Davison or by anyone else; but they were retained by the partnership. Other books kept included a cash receipts journal, a sales journal and a sales (or debtors') ledger. There was no creditors' ledger, because the habit of the partnership was to pay all its accounts immediately upon receipt. The books of first entry having been written up by Davison, a principal of the firm of accountants, Mr. D.S. Martin, entered up from them the partnership's private ledger, and he prepared the annual balance sheets and accounts, and (usually) the partnership income tax returns. The appellant prepared his personal income tax returns, taking on each occasion from the partnership return as prepared by Mr. Martin the amount to be shown as his share of the partnership profits. I am satisfied that all this was done, so far as the partners and Mr. Martin were concerned, in complete good faith, and that the appellant always believed that the partnership income tax returns were in all respects correct and that his personal return showed the correct amount of his share of the profits. The partnership accounts were never audited, but Mr. Martin has given evidence, which I accept, that in the circumstances of the business he considered, and advised the partners, that an audit was unnecessary. (at p451)