( ( ( ( Registry ( of ( ( toxic effects ) ( of ( chemical substances ) ) ) ) ) : ) ( Wood dust ) ) . )
(ROOT (NP (NP (NP (NNP Registry)) (PP (IN of) (NP (NP (JJ toxic) (NNS effects)) (PP (IN of) (NP (NN chemical) (NNS substances)))))) (: :) (NP (NP (NNP Wood)) (NP (NN dust))) (. .)))
Registry of toxic effects of chemical substances: Wood dust.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG burning) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NN wood)))))))) (VP (VBZ forms) (NP (DT a) (JJ different) (NN chemical) (NN substance))) (. .)))