The appointment to a commission in one of the flying services can be either temporary or permanent. The former holds good until the end of the war, the latter for as long as the would-be airman wishes to retain it. For a period of from four to six months he must undergo a probationary course; if after that time he has served satisfactorily he will be confirmed in his rank. Upon first joining up he will receive a uniform allowance of £20, and at the confirmation a further £20. These amounts should easily cover his requirements and enable him to buy a complete flying outfit. During the probationary period he will receive 14_s._ a day in pay; when he is confirmed in rank, 18_s._ a day in the Royal Naval Air Service, and 20_s._ per day in the Royal Flying Corps. Service etiquette plays a prominent part in the matter of uniform. In the military wing he will be expected to wear the button-over tunic and forage cap of the Flying Corps, with breeches and long brown field-boots. In the R.N.A.S. the matter of dress is a more difficult and more delicate one. In the first place, with regard to the cap, there are four entirely separate badges in the Naval Service: they are (1) the big silver anchor and the gold crown of the regular Navy; (2) the smaller replica of the Royal Naval Reserve; and of the Royal Naval Volunteer Reserve, to which latter branch the aeroplane observer always belongs; and lastly the silver bird of the R.N.A.S., worn only by pilots. In hosiery the naval flying man must confine his taste to plain white shirts with collars to match; black ties, and socks of the plain black variety. His shoes must be unadorned of toecap, and it is a cardinal sin to leave the buttons of his jacket undone, if he reveal as much as a button of the waistcoat beneath. There is an amusing story told concerning a famous English airman who has since resigned from the R.N.A.S. On the occasion of his appointment to the Service he had to visit a certain big man at the Admiralty, and arrived there in the brass hat of a full-blown naval commander, with a black-and-white striped tie, in which there coyly reposed a large diamond pin. When the interview was over the big man called him back. “You’ve forgotten something.” “What is it, sir?” the airman inquired. “Your pink shirt and your purple socks,” was the reply. Another new hand--an Australian--presented himself to the astonished and apoplectic commanding officer of his first station wearing a blue monkey-jacket, white flannel trousers, green socks, and brown shoes. Luckily he was a good-tempered youth, or he would never have been able to live down the subsequent ragging he got from all the other members of his mess. Flying-clothes must be the warmest procurable: a black or brown leather coat lined with lamb’s wool, with trousers to match. Good flying-coats cost from three to five guineas, and the trousers range from a guinea to thirty shillings in price.