| | | | | | | | | |Other (including | | | | | | | | |paralysis of deltoid, | | | | | | | | |muscles of speech, | | | | | | | | |locomotor ataxy) | 10 | 3 | 1 | 3 | 1 | -- | 2 | +-------------------------+------+-----+-----+-----+-----+-----+-----+ | | 798 | 147 | 157 | 139 | 138 | 114 | 118 | +-------------------------+------+-----+-----+-----+-----+-----+-----+ TABLE VI.--ENCEPHALOPATHY. +--------------+-----+-----+-----+-----+-----+-----+-----+-----+ | Symptom. |1911.|1910.|1909.|1908.|1907.|1906.|1905.|1904.| +--------------+-----+-----+-----+-----+-----+-----+-----+-----+ |Epilepsy | 6 | 16 | 12 | 15 | 14 | 11 | 12 | 15 | |Optic neuritis| 2 | 3 | 3 | 2 | 3 | 7 | 5 | 4 | |Mental defect | 5 | 2 | 2 | 1 | 6 | 3 | 1 | 2 | +--------------+-----+-----+-----+-----+-----+-----+-----+-----+ | Total | 13 | 21 | 17 | 18 | 23 | 21 | 18 | 21 | +--------------+-----+-----+-----+-----+-----+-----+-----+-----+ The same state of things is found in all the other industries. Particular factories, owing to special method of manufacture or special manner of working, may have an incidence out of all proportion to that prevailing in the trade generally. And it is, of course, control of these more obvious sources of danger by the efforts of manufacturers and the factory inspectors that has led to the notable reduction recorded--_e.g._, in white lead works and the pottery industry. Returns of occupiers do not lend themselves readily to exact estimate of the number of persons exposed to risk of lead poisoning, as they do not differentiate the processes, and in nearly all factories in which lead is used some of those returned will not come into contact with it. In industries, however, in which there is periodic medical examination of persons employed in lead processes an attack rate can be made out. It must be regarded as approximate only, as in the manufacture of electric accumulators, for instance, medical examination is limited to persons employed in pasting, casting, lead-burning, or any work involving contact with dry compounds of lead, whereas the reported attacks include a few persons engaged in processes other than those named. TABLE VII.--ATTACK RATE FROM LEAD POISONING IN THE YEAR 1910 IN CERTAIN INDUSTRIES.