Sentence:  In this great stretch of country there is no sign of life, nor of anything <WSD>appertaining</WSD> to life. There is no bird in the steel-blue heaven, no movement upon the dull, grey earth&mdash;above all, there is absolute silence. Listen as one may, there is no shadow of a sound in all that mighty wilderness; nothing but silence&mdash;complete and heart-subduing silence. 
Meaning of the word marked with <WSD> tags:  To belong as a part, right, possession, attribute, etc..