If it is difficult to distinguish rightly all the cases classed as “paralysis,” it is even more difficult to determine what should be included under the term “encephalopathy.” We have limited it to epileptiform seizures, optic neuritis (uncomplicated by epilepsy), and various forms of insanity. Table VI. on p. 54 is interesting as showing how fairly constant the numbers are from one year to another. Except in the one industry of earthenware and china, in which a return of the number of persons employed according to process and kind of ware has been made on three separate occasions, and in which the reports of the certifying surgeons enable the cases of poisoning to be classified in the same way, it is difficult to determine accurately the attack rate of lead poisoning. Even in the earthenware and china trade many things have to be borne in mind. The poisoning which occurs is not distributed evenly over all the factories. Thus, among the 550 potteries, in the years 1904 to 1908, five potteries were responsible for 75 cases, and 173 for the total number of cases (517), leaving 377 factories from which no cases were reported. TABLE V.--FORMS OF PARALYSIS: 1904-1909. +-------------------------+------+-----+-----+-----+-----+-----+-----+ | Form of Paralysis. |Total.|1909.|1908.|1907.|1906.|1905.|1904.| +-------------------------+------+-----+-----+-----+-----+-----+-----+ | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | |Arms and legs {complete| 12 | 2 | 2 | 1 | 2 | 1 | 4 | | {partial | 62 | 13 | 7 | 9 | 13 | 9 | 11 | | | | | | | | | | |Legs {complete| 3 | -- | -- | 1 | -- | 1 | 1 | | {partial | 25 | 5 | 7 | 1 | 3 | 5 | 4 | | | | | | | | | | |Both forearms {complete| 162 | 29 | 33 | 29 | 28 | 24 | 19 | | {partial | 334 | 59 | 70 | 56 | 56 | 43 | 50 | | | | | | | | | | |Right forearm {complete| 39 | 11 | 6 | 7 | 4 | 8 | 3 | | {partial | 62 | 9 | 17 | 14 | 11 | 5 | 6 | | | | | | | | | | |Left forearm {complete| 14 | 2 | 2 | 4 | 1 | 3 | 2 | | {partial | 22 | 4 | 1 | 4 | 6 | 4 | 3 | | | | | | | | | | |Fingers | 36 | 3 | 3 | 7 | 10 | 6 | 7 | | | | | | | | | | |Neuritis (including | | | | | | | | |numbness of hands or | | | | | | | | |arms) | 32 | 7 | 8 | 3 | 3 | 5 | 6 |