▁chosen ▁from ▁some ▁of ▁the ▁best ▁writers , ▁old ▁and ▁new , ▁of ▁English ▁nov els , ▁short ▁stories ▁and ▁plays . ▁The ▁non - f iction ▁consists ▁of ▁completely ▁new ▁books ▁spe cially ▁written ▁for ▁this ▁series , ▁on ▁various ▁aspects ▁of ▁English ▁life ▁and ▁institutions . ▁ ▁The ▁books ▁are ▁meant ▁for ▁serious ▁adult ▁students , ▁and , ▁though ▁the ▁voc ab ul ary ▁is ▁carefully ▁controlled , ▁the ▁style ▁is ▁natural ▁and ▁vig orous , ▁and ▁there ▁is ▁no ▁question ▁of ▁any ▁child ish ▁" writing ▁down ." ▁The ▁voc ab ul ary ▁is ▁fund ament ally ▁that ▁of ▁the ▁four ▁books ▁of ▁Ess ential ▁English . ▁But , ▁to ▁w iden ▁the ▁students ' ▁knowledge ▁of ▁the ▁language , ▁the ▁same ▁principle ▁has ▁been ▁adopted ▁in ▁this ▁series ▁as ▁in ▁the ▁later ▁books ▁of ▁Ess ential ▁English . ▁So ▁a ▁number ▁of ▁new ▁words ▁( aver aging ▁three ▁or ▁four ▁to ▁a ▁page ) ▁occur ▁in ▁each ▁volume , ▁but ▁every ▁new ▁word ▁is ▁given , ▁with ▁the ▁ph on etic ▁trans cription , ▁in ▁the ▁G loss ary ▁at ▁the ▁end ▁of ▁the ▁book , ▁and ▁each ▁word ▁in ▁the ▁G loss ary ▁is ▁defined ▁within ▁the ▁voc ab ul ary ▁of ▁Ess ential ▁English . ▁ ▁All ▁the ▁books ▁are ▁about ▁the ▁same ▁length , ▁and ▁are ▁illustrated ▁with ▁photograph s ▁or ▁line ▁draw ings . ▁ ▁English ▁teacher ▁Charles ▁E wart ▁E ck ers ley ▁wrote ▁Ess ential ▁English ▁for ▁Foreign ▁Stud ents , ▁volumes ▁