(2)The service books in each year should be taken up for verification at a fixed time in the year, say in January, by the head of the office who after satisfying himself that this services of the government servant concerned are correctly recorded in his service book should record and sign a certificate in the memorandum of verification in form no. 15, which should be made part of the service book.The head of the office in recording the annual certificate of verification should, in the case of any portion of service that cannot be verified from office records, distinctly state in the remarks column of the memorandum of verification that for the excepted periods (naming them) a statement in writing by the government servants as well as a record of the evidence of his contemporaries is attached to the book.