Sentence:  Coming forward and seating himself on the ground in his white dress and tightened turban, the chief of the Indian <WSD>Jugglers</WSD> begins with tossing up two brass balls, which is what any of us could do, and concludes with keeping up four at the same time, which is what none of us could do to save our lives, nor if we were to take our whole lives to do it in. 
Meaning of the word marked with <WSD> tags:  A person who practices juggling.