(_a_) There are yet to be inspected and observed the following activities, which have not so far been mentioned: [Sidenote: Additional naval bases.] United States naval base at Cardiff, Subchaser Detachment Two, based on Corfu, Captain C.P. Nelson, United States naval air stations in Italy. (_b_) It is not deemed practicable to visit the United States naval forces based at Gibraltar (Rear Admiral Niblack), nor the United States naval forces based on the Azores, because of difficulties of transportation, as is also the case in regard to the U.S.S. _Olympia_ in northern Russia. V. UNITED STATES NAVAL AVIATION IN EUROPE. [Sidenote: Aviation Headquarters in Paris and London.] (_a_) The establishment of United States naval aviation in Europe has been one of the most difficult and involved tasks which have had to be undertaken and brought into effect. Captain H.I. Cone arrived in Europe for this work about October 1, 1917, and has continued in charge of it ever since. He maintained headquarters in Paris until about August 1, 1918, when he removed to London and was designated as aid for aviation on staff of the commander of United States naval forces in Europe. [Sidenote: Supplies arranged for by cable.] (_b_) There were arrangements to be made with the French and the British as to locations for stations that would be best adapted for cooperation. There were further arrangements to be made as to the procurement of sites or the taking over of the stations already in operation or in process of construction. The Navy Department had also to be communicated with, largely by cable, as to design, quantities, and shipments of material, which upon receipt had to be allocated with a view to completing certain stations as soon as possible while not delaying the progress of the general scheme any more than could be helped. [Sidenote: Coastwise transportation difficult.] (_c_) Delays and mistakes in the shipment of aviation material probably caused more trouble than any other one thing, for when material once arrives in a European port it has been, and still is, a very difficult matter to arrange for coastwise transportation. [Sidenote: Creditable progress.] (_d_) Taking into consideration the necessary scope of the project, the difficulties inherent in providing for establishments on foreign soil, and the delays which the magnitude of the undertakings caused in the production and shipment of material (and personnel) from the United States, the state of progress is considered highly creditable to Captain Cone and to his assistants. VI. Y.M.C.A. AND SIMILAR ACTIVITIES. [Sidenote: Y.M.C.A. activities.]