An economic study of such a connection was made. A causeway of filled ground was determined to be feasible, constructed of reef material in an earth-filled section. $1,423,000. The cost of such a connection might approximate It is not considered justified for the use criteria specified. For planning purposes, therefore, boat transvortation is assumed between “niwetok and Parry Islands, and personnel piers are located at the nearest ends of both islands, resulting in a boat trip of two miles. where road connections would be advantageous are: Other locations (a) fran Rojoa to Biijiri, (b) Muzin to Engebi and (c) Bogombogo to Bogallua. These causeways would make possible the location of the living camps on the firstenamed islands, where there are trees, and camp conditions are better. type between islands would be beneficial but costly. Connections of any With the exception of a connection between Rojoa and Biijiri, it is believed the cost would not be justified on the basis of only two series of tests. The water distance be- tween Rojoa and Biijiri is short and the area on Biijiri that is available for a camp site is entirely bare. Under these conditions, it is believed the cost is justified, so studies have been made of several methods of accom= olishing this connection. In Section IV will be found a complete discussion of each method. Materials. The climatic conditions at the “niwetok Atoll are such that liaterials ordinarily used in construction deteriorate rasidly and are not suitable, even on the basis of a short period of use. Careful consideration, therefore, has been given to selection of materials which are resistant to high humidity and to salt spray. Airplane Requirements. For inter-island air transportation, L-5 planes were used during the last operation and proved satisfactory. Consideration should, however, be given to commercial vlane tynes carrying two or three III - 8