Even if we admit Mr. Reid’s conception, this by no means solves the problem. It is quite conceivable that the world could purchase certain sorts of immunity too dearly. If it was a common thing to adorn the parapets of houses in towns with piles of loose bricks, it is certain that a large number of persons not immune to fracture of the skull by falling bricks would be eliminated. A time would no doubt come when those with a specific liability to skull fracture would all be eliminated, and the human cranium would have developed a practical immunity to damage from all sorts of falling substances. But there would have been far more extensive suppressions than would appear in the letter of the agreement. This no doubt is a caricature of the case, but it will serve to illustrate my contention that until we possess a far more subtle and thorough analysis of the drunkard’s physique and mind--if it really is a distinctive type of mind and physique--than we have at present, we have no justification whatever in artificial intervention to increase whatever eliminatory process may at present be going on in this respect. Even if there is such a specific weakness, it is possible it has a period of maximum intensity, and if that should be only a brief phase in development--let us say at adolescence--it might turn out to be much more to the advantage of humanity to contrive protective legislation over the dangerous years. I argue to establish no view in these matters beyond a view that at present we know very little. Not only do ignorance and doubt bar our way to anything more than a pious wish to eliminate criminality and drunkenness in a systematic manner, but even the popular belief in ruthless suppression whenever there is “madness in the family” will not stand an intelligent scrutiny. The man in the street thinks madness is a fixed and definite thing, as distinct from sanity as black is from white. He is always exasperated at the hesitation of doctors when in a judicial capacity he demands: “Is this man mad or isn’t he?” But a very little reading of alienists will dissolve this clear assurance. Here again it seems possible that we have a number of states that we are led to believe are simple because they are gathered together under the generic word “madness,” but which may represent a considerable variety of induced and curable and non-inheritable states on the one hand and of innate and incurable and heritable mental disproportions on the other.