already seen, is peculiarly favorable to the formation of the neurotic habit, and I must emphatically state my belief that among the seriously-minded English middle classes, more especially, whose life is necessarily colorless and monotonous, the mischief thus worked is both grave and widely spread. Perhaps the maximum of damage that can be inflicted through the mind upon the sensory nervous centres is effected when to the kind of self-consciousness that is generated by an excessive spiritual introspection there is added the incessant toil of a life spent in sedentary brain-work, and checkered with many anxieties, and many griefs which strike through the affections. Doubtless, such a combination of morbid mental influences is sufficient of itself to generate the neuralgic disposition in its severest forms, without any hereditary neurotic influence, and without any other peripheral irritations; I have more than one such instance in my mind at this moment. But, if they can do this, much more can such influences arouse inherent tendencies to neuralgia; to persons who are predisposed in this manner they are most highly deleterious. 3. We come now to the peripheral influences which in a more obvious manner become factors in the production of neuralgia. Of such influences there are an immense variety, and the only common quality that can be predicated of all is the tendency directly to depress the life of the sentient centre upon which their action impinges. If we search among the external influences which contribute to the production of neuralgia for one that is apparently trivial as to the amount of material disturbance which it can cause, and yet is very frequently effective, we may select the agency of cold. The effect of a continuous cold draught of air impinging on the naked skin for some time is comparatively frequently seen in the provocation of neuralgic attack: we say comparatively, because this influence is more frequently effective than blows, wounds, or temporary irritations of any kind, applied to the peripheral ends of sensory nerves. But if neuralgia be a more frequent consequence of cold than of these other influences, a moment's reflection will show that it is by no means an absolutely common result. One has only to think of the numerous omnibus-drivers, engine-drivers, cab-drivers, etc., etc., who pass their whole working lives in presenting the (more or less) naked expanse of their trigeminal and their cervico-occipital nerves to every variety of wind, to perceive that, were this sort of influence very potent in itself, male neuralgic patients should swarm as thick as bees in our hospital and dispensary out-patient rooms; which is notoriously quite contrary to the fact. The same remarks, in both directions, may be applied to the direct influence of atmospheric moisture, either with or without the effect of wind (of course I am not speaking of the more recondite effects of damp soil on the persons who live about it).