On inquiring the reason why so many highly desirable persons have been cast out from the sieve of their hospital training, I have been told that the fact causes no concern to the authorities, so numerous are the women pressing in to take the place of the defeated strugglers for existence. If this is no answer to the inquiries, it is at least as good as most of the replies one gets when seeking for information on this unsatisfactory subject. Supposing it to be true, we may well ask further whether a too great narrowing of the spaces of the sieve in a particular direction, combined probably with an extreme elongation in another direction, does not tend to produce ill-shapen and one-sided nurses? I say _tend_, because the present system is still new, and though it may have immediate advantages, we should not blind ourselves to its possible disadvantages in the future. We need always to remember that a process of selection which ensures the survival of the toughest does not necessarily ensure the survival of the fittest. There is such a thing as evolving backwards, like the cave-fish who have lost their sight during their long residence in the dark. The best things in life are not machine-made. But correct observation being such a complicated performance, we should be very indulgent to people who make mistakes; especially so if we have ever made a mistake ourselves. In our plentiful abuse of individuals, we merely display our inability to recognise the limitations and imperfections of “the thing called human nature.” We have reached a certain landing-place in our upward climb by means of paying attention to our sieves, but we have a long way still to go. A few very simple experiments will suffice to show us how hard a thing it is to see even what lies right under our very noses. We may then perhaps realise how rash it is to form hasty opinions about the complicated and invisible nervous systems of our suffering fellow-creatures. Having got thus far, it may even dawn upon us that to make our fanciful and erroneous theories (fanciful because founded on insufficient knowledge, and erroneous because founded on the defective observations of others) the excuse for ill-treating other people’s nerves by showing a want of consideration for their sufferings, by tormenting them with painful and fantastic tricks, and by indulging our own tyranny and self-righteousness, is to manifest to the world an extremely primeval species of childishness.