The Institute of Actuaries has always been ready to welcome contributions from members able to give information regarding the mortality found to prevail among special classes of lives, and among lives resident in other parts of the world than Great Britain. The authors of the present paper having had occasion to look closely into the subject of West Indian mortality, chiefly in connection with the financial affairs of the Barbados Mutual Life Assurance Society, have therefore willingly responded to an invitation to lay before the members of the Institute some account of the statistics which they have been able to gather, and of the conclusions at which they have arrived. They desire, in the first place, to express their thanks to the directors of the Barbados Mutual Society for permitting them to publish the results of the society's mortality experience, and to Mr. Spencer C. Thomson, the manager of the Standard Life Office, for some valuable statistics relating to the experience of that office regarding West Indian mortality.