At a sessional meeting of the Institute held during the period allocated to the collection of the information required for the compilation of the New Mortality Tables, a discussion may not, I think, inappropriately be raised on various points arising in connection with the nature and adaptability for the purpose of the materials used in the construction of the principal Institute Table at present in use, and it is with this view that I venture to submit to the members of the Institute the results of some attempts which I have recently been making to trace the effects produced on the HM Table by the fact that, at the close of the observations from which the Table is derived, there were still in existence nearly 75,000 out of 130,000 males who had come under observation; I have also endeavoured to obtain from the details given in the Mortality Experience published by the Institute some approximate figures as to the new business of the Twenty Offices which supplied the experience upon which the HM Table is based.