smelting, white lead, red lead, litho-transfers, enamelling, electric accumulators, paints and colours, and coach-painting, and the symptoms in these industries are, in general, colic rather than high degree of paralysis; but in them a severe symptom which is above the average, in general, is encephalopathy. The explanation of these differences depends, we believe, on two factors: (1) Duration of employment, with which, naturally, the age of the worker is associated; (2) opportunity of inhaling lead dust. The longer the employment, the more likely, naturally, if absorption goes on, is the plumbism to become chronic, and to be associated with paralysis, its prominent sign. Duration of employment among males in file-cutting and china and earthenware, as contrasted, for instance, with that in white lead, is very much longer, and the same could be shown of comparatively new industries, such as electric accumulators and litho-transfers. Thus, in one year the age distribution and duration of employment of those attacked in three of these industries was as follows: +---------------------+-------------------+-------------------+ | | | Duration of | | | Age Distribution. | Employment. | | Industry. +---------+---------+---------+---------+ | | | | Under | Over | | |Under 30.| Over 30.| 5 Years.| 5 Years.| +---------------------+---------+---------+---------+---------+ | |Per Cent.|Per Cent.|Per Cent.|Per Cent.| |China and earthenware| 59·4 | 40·6 | 52·2 | 47·8 | |White lead | 45·7 | 54·3 | 86·8 | 13·2 | |File-cutting | 22·9 | 77·1 | -- | 100·0 | +---------------------+---------+---------+---------+---------+