24 within two months-in the case of an officer serving on agreement. 100. An officer may be granted, in addition to the cost of his own passage, an allowance towards the cost of the passage tickets of his wife and (or) family between the United Kingdom and East Africa. The officer may also, if he wishes, travel by a lower class than that by which he is privileged to travel and apply the saving towards the cost of his family’s passages. The grant will be made only once in respect of passages in each direction during a tour of service, and officers to whom a grant is made will be required to sign an agreement that they will refund any portion of the grant which is not actually expended on passage tickets. In the case of the homeward journey the grant is conditional on the officer completing a minimum tour of service, unless sent home earlier for medical reasons or on public grounds. “ Family "” means an officer's children who are unmarried, under 21 years of age, and dependent on their parents for subsistence. It does mot include nurses, the husband of a female officer, or relations other than children. 101. Free passages to East Africa will not be granted to wives or children under Regulation 111. 102. A tour of residential service shall be from 20 to 30* months, at the discretion of the Governor, but an officer may be detained beyond 301 months if, in the opinion of the Governor, the exigencies of the Service require it, and if a favourable medical report on the officer’s health has been obtained. Subject to the necessities of the Service, European officers may, after every tour of residential service. * In Somaliland, 12 to 15 months. 1 In Somaliland. 15 montha