Section 3
SEC. 3. Any savings in the appropriation, allotment, or fund for salaries and wages, authorized for any fiscal year for the department of the government concerned, or for any of its branches, subdivisions, agencies. or instrumentalities, including corporations and enterprises owned or controlled by it, may be used for the temporary employment of substitute officers or employees to take the place of those who are granted maternity leave, if the duties of the latter cannot be dispensed with without detriment to the service, and the same cannot1 be assigned to, or distributed among, the other employees already in the service.