Phalanx

The ancient Greek formation for heavy infantry consisting of a line of parallel columns. Because of its depth and solidity it was capable of penetrating, any line of troops. The Lace daemon i an or Spartan was the oldest phalanx and in this the soldiers stood eight deep. It varied in depth from four to twenty-five ranks of men. P. H. Helmet. — A gas mask consisting of a double flannelette bag with two eyepieces and a mouthpiece consisting of a hard tube on the inside and a flat piece' of rubber on the. outside through which the breath can be exhaled, but which collapses if attempt is made to inhale through it. The flannelette is impregnated with solutions of carbolic acid and phenol, caustic. soda, hexamine and glycerine.