(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.