1. Except in cases of special necessity, persons from whom forced or compulsory labour is exacted shall not be transferred to districts where the food and climate differ so considerably from those to which they have been accustomed as to endanger their health.

2. In no case shall the transfer of such workers be permitted unless all measures relating to hygiene and accommodation which are necessary to adapt such workers to the conditions and to safeguard their health can be strictly applied.

3. When such transfer cannot be avoided, measures of gradual habituation to the new conditions of diet and of climate shall be adopted on competent medical advice.

4. In cases where such workers are required to perform regular work to which they are not accustomed, measures shall be taken to ensure their habituation to it, especially as regards progressive training, the hours of work and the provision of rest intervals, and any increase or amelioration of diet which may be necessary.