I am unable to state with accuracy, in these several instances, what proportion subsists between the preventable mortality and the number of living persons, for I have no means of ascertaining precisely the population of the separate Wards; and without this knowledge it is impossible to arrange them in a scale of comparative healthiness. I need hardly remind your Hon. Court that the Wards differ very considerably in their magnitude; so that the largest majority of cases occurring in one Ward (as in Farringdon Without) must not unconditionally be taken to imply that the Ward, _in proportion to its population_, suffers more deaths than one in which the apparent number is less considerable. In the table to which these remarks refer, I have endeavoured to give you the means of comparing (at least approximatively) the healthiness of your several departments, by entering against the name of each Ward the number of holdings for which it stands assessed to your rate. This entry, with some trifling modifications specified in the table, may be taken to express the number of houses contained in each Ward of the City: thus it furnishes indirectly the means for estimating the local population. It will be noticed, that the more glaring inequalities which I have adduced are in some degree due to the epidemic of last year, which did not press uniformly on all parts of the City. It may, however, likewise be observed, that the chief operation of that epidemic was to exaggerate, but not importantly to misrepresent, the features of each locality; that the habitual sanitary proportions of districts to each other were for the most part preserved; that (with a qualification to which I shall presently revert) the Wards numbering fewest deaths last year numbered also fewest this year.