The second diagram shows that, even taking the Commission’s favourite method of comparing the zymotics separately with small-pox, all of them except measles show a similar or a greater decrease during the period of official registration, and also agree in the periods of slight increase, again proving the action of the same general causes (which I have pointed out at p. 37), and leaving no room whatever for the supposed effects of vaccination. Diagram III. shows that similar phenomena occurred in England and Wales as a whole, the other zymotics and the total deaths obeying the same laws of increase and decrease as small-pox. Comparison with diagram I. shows the much greater severity of small-pox epidemics in London, illustrating the fact, which all the statistical evidence of all countries strikingly enforces, that _small-pox mortality is, other things being equal, a function of density of population_, while it pays no regard whatever to vaccination. This is further shown by the short, thick dotted line which exhibits the total number of vaccinations since 1872, when private as well as public vaccinations were first officially recorded, and which proves that the continuous _decrease_ of vaccination since 1882 has been accompanied by a decided _decrease_, instead of an increase, in small-pox mortality. Diagram IV. shows the statistics of mortality in Ireland and Scotland from small-pox and certain chosen zymotics, from the tables which were laid before the Commission by the official advocates of vaccination. These show two striking facts, which the Commissioners failed to notice in their _Final Report_. First, the smaller amount of small-pox mortality in Ireland than in Scotland, the latter being alleged to be well vaccinated, the former imperfectly so; and, secondly, the similar difference in the two chosen diseases and the general parallelism of the two. Here again we see clearly the influence of _density of population_, Scotland having a very much larger proportion of its inhabitants living in large manufacturing towns.