" (c),When the number of permanent employees aim exceeds four hundred, the owner, lessee, or operator, in addition to keeping a stock of medicines and employing the services of a physician for the purpose specified in the preceding two subsections, shall maintain an infirmary or:emergency hospital of sufficient capacity to contain one-bed for each one hundred employees and laborers, except where this shall be unnecessary because of the existence of a hospital in the place, or within a distance of not more than five kilometers from the boundary limits of the city,municipality or municipal district, where the shop, factory, estate or commercial, industrial, or agricultural establishment is located, and where, in the latter cases, said hospital is accessible by any national,provincial, or municipal road. In any of such excepted cases, the owner, lessee, or operator may enter into an agreement with said hospital to reserve the necessary number of beds for the purposes specified in this subsection: Provided,That the number of beds may be increased to three for each two hundred laborers and employees, according to the nature of the establishment or the work, in the discretion of the Director of Health.
"The physicians of the commercial, industrial, and agricultural establishments shall subject all the:employees and laborers of said establishment to a physical examination at least once a year and shall make detailed monthly and annual reports of all the services rendered by them.
"For the purposes of this Act, a person or establishment shall be understood to have employees or laborers in its permanent service when the work requires the constant employment of such operatives, even though these change frequently."