Lichen Urticatus And The Prurigos are closely related to urticaria, and here again we meet with a highly susceptible vasomotor or sensory nerve system set in action by a variety of excitants, which often elude our investigation. Lichen urticatus is a recurrent eruption of early childhood, and often proves most intractable. It especially evolves in the evening. After the exclusion of all possible external excitants, such as irritating and heating clothing and fleas, it is desirable to minutely investigate the functioning of the gastro-intestinal tract with a view to seeing that the digestion is well performed, and that no poisonous excitants are elaborated. The quantity and quality of the food must be carefully adjusted according to the age of the child. Some French authors insist on the frequency of dilatation of the stomach. The prurigos are characterized by the repeated formation of itching papules with many analogies with the wheal, and the reaction is met with under several conditions. In the commoner form beginning in childhood, there seems to be an ingrained state of cutaneous nerve instability, so that the eruption may be lifelong. The subjects of this eruption are characteristically pallid and spare. Here, again, as for lichen urticatus we protect the skin from all external excitement, and endeavour to prevent any possible source of irritation by careful dieting, and seeing that the gastro-intestinal functions are perfectly carried out. As in the other reactions in which the cutaneous nervous system is especially involved, a protection of the skin by an occlusive dressing goes far to stop the evolution of eruption, and seems to point to the importance of external irritation. Nevertheless the existence of dyspeptic and metabolic troubles has a strong hold on the profession, at any rate as a predisposing cause.