The French government also maintains at Paris the Laboratoire des Recherches sur le Travail Professionel,--an establishment for the scientific examination of wounded men, particularly to ascertain the percentage of their disability in the labor market. The question of how many disabled men are capable of reëducation is one not rigidly determined. There are, of course, some hopeless cases which will have to be entirely dependent on the government for their support, whether by pension or other means under discussion. But the figures of Dr. Jules Amar, director of this laboratory of industrial research, a man who has devised mechanical apparatus for developing the capacities of injured limbs, show that of the maimed cases which have come under his observation at least 80 per cent are capable of vocational reëducation. Of this proportion 45 per cent succeed in earning normal salaries after a training including some specializing; 20 per cent are partially restored to normal wage earning; while the remaining 15 per cent can only obtain work in shops maintained especially for the disabled, such as a toymaking studio. Of the reëducation of this 80 per cent Dr. Amar says: "It is a question of science and method; it demands the organization of training schools.... It unites medical and technical knowledge to the end that artificial limbs shall be adapted to satisfy physical and vocational capabilities. The proportion of men dependent upon relief is then reduced; and one must endeavor, without ceasing, to diminish it."[6] The method in the Paris schools is scientific. "In the training schools," he continues, "the object of the instruction is to supplement the diminished physical capacity of the disabled man with a greater knowledge of his trade, superior technical instruction, or better vocational adjustment." [6] Special Bulletin of Military Hospitals Commission, Canada, April, 1916. The first responsibility falls on the medical examiner. To reëquip the maimed physically, an indispensable prosthesis (an addition of an artificial part to supply the missing member of the body) is made, the _dynamical_ prosthesis--not the kind which _replaces_ the member, but that which reëstablishes or repairs the _functions_. What the wounded man needs is not an admirable imitation of the missing arm or leg, ingenious and often fragile appliances, but a practical working tool,--a socket into which a variety of tools can be fitted.