(_d_) Cooking, if possible, will be done behind the front-line trenches and should be concentrated by sections or companies. Steps must be taken to ensure that as little smoke as possible is made by the cooks' fires. (_e_) Unused rations will be returned to the quartermaster. (_f_) Waste in any form will be discouraged. (_g_) Arrangements should be made to ensure that soup or some hot drink should be available for the men between midnight and 4 a. m. =21. VERMOREL SPRAYERS.=--(_a_) Vermorel sprayers form part of trench stores. They are provided for clearing gas out of trenches and shelters after an attack, and for respraying helmets if necessary during a prolonged gas attack. (_b_) They will be distributed at easily accessible points in the trenches and protected from shell fire. (_c_) They must be kept one-third full of water. Six gallons of the following solution to be used in them must be kept in corked rum jars close to each sprayer. It must not be kept in the sprayers owing to its corrosive nature: Water, 3 gallons (one large bucket). Sodium thiosulphate (hypo), 6 lbs. (two piled mess tins). Sodium carbonate (washing soda), 2 lbs. (one mess tin). (_d_) Each company will have a squad of men in charge of an N. C. O. trained in the care and use of sprayers. (_e_) On taking over trenches, the N. C. O. in charge of sprayers will take over from the outgoing N. C. O. and will see that each is in order and provided with solution. (_f_) A man will be told off to each sprayer; he will be responsible for testing it every day, and in case of a gas attack he will stand by to use it when ordered. RELIEFS. =22. GENERAL.=--(_a_) Prior to taking over a new line of trenches the commanding officer, adjutant, machine-gun officer, signaling officer, and company commanders will reconnoiter the trenches. (_b_) Machine guns will not be relieved at the same time as the infantry. =23. POINTS TO BE NOTED BY COMPANY COMMANDERS.=--(_a_) Number of men holding line to be taken over and distribution. (_b_) Shelter accommodation. (_c_) Work being done and proposed. To ensure a continuity of work an officer of the incoming battalion should go over line in daylight. (_d_) Condition of the wire and defenses generally. (_e_) Information as to the enemy, his habits, snipers, the work he is doing, &c. (_f_) Water supply. (_g_) Artillery support. (_h_) Communications. (_i_) Dangerous points. (_j_) Lines of advance to be used in a counter attack. (_k_) Position of "shell trenches" or "feathers," or other cover from enemy artillery fire. =24. GUIDES.=--(_a_) Arrangements will be made between the C. O. of relieving and about to be relieved battalions as to places where guides will be provided by the latter to conduct the incoming troops to the trenches. (_b_) One guide per platoon, one for each company headquarters, and one for battalion headquarters will be provided.