Sentence:  We see, too, that the disaster of which the world actually stood in imminent deadly peril has been averted, and that if every pound of saltpetre in the mines of Chili were suddenly to dissolve into its elements, the human race would still be able to guard itself against the <WSD>unhumanity</WSD> of nature. 
Meaning of the word marked with <WSD> tags:  The quality of being other than human.