Sentence:  When however the <WSD>first flush</WSD> of our surprize is over we cannot fail to perceive that amid all this legerdemain there is a vast deal of nature united with that astonishing splendour of colouring which so many have tried to emulate. 
Meaning of the word marked with <WSD> tags:  (by extension) The beginning; the period of time when something is first starting.