Sentence:  In Berlin he published his views of the chemical laws of nature in German and this was issued in French translation ( Paris , 1813 ) under the title Recherches sur l ' identite des forces chimiques et electriques , a work held in very high esteem by the new generation of <WSD>research</WSD> chemists . 
Meaning of the word marked with <WSD> tags:  systematic investigation to establish facts