Sentence:  ( 1 ) When an object was placed in the patient 's hand , he had no difficulty determining whether it was warm or cold , sharp or blunt , rough or smooth , flexible , soft , or hard ; and he could tell , simply by the feel of it , whether it was made of wood , iron , cloth , <WSD>rubber</WSD> , and so on . 
Meaning of the word marked with <WSD> tags:  an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products