Sentence:  The wasp has always made the paper from which it constructs its nest, by uniting vegetable fibres with <WSD>glue,</WSD> while man was vexing himself with attempts to write on the bark of trees or a waxen or metallic table. 
Meaning of the word marked with <WSD> tags:  A hard gelatin made by boiling bones and hides, used in solution as an adhesive; or any sticky adhesive substance.