( ( ( ( ( Wood ( also ( ( burned ( through ( addition ( of air ) ) ) ) ( to ( its substance ) ) ) ) ) , ) but ) ( it ( ( did not ) ( ( ( appear ( to ( gain weight ) ) ) , ) ( because ( ( the ( new substance ) ) ( formed ( -LRB- ( ( carbon dioxide ) ( -RRB- ( ( was itself ) ( ( a ( ( gas and ) vanished ) ) ( into ( the atmosphere ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Wood)) (ADVP (RB also)) (VP (VBD burned) (PP (IN through) (NP (NP (NN addition)) (PP (IN of) (NP (NN air))))) (PP (TO to) (NP (PRP$ its) (NN substance))))) (, ,) (CC but) (S (NP (PRP it)) (VP (VBD did) (RB not) (VP (VB appear) (S (VP (TO to) (VP (VB gain) (NP (NN weight))))) (, ,) (SBAR (IN because) (S (NP (DT the) (JJ new) (NN substance)) (VP (VBD formed) (SBAR (S (-LRB- -LRB-) (NP (NN carbon) (NN dioxide)) (-RRB- -RRB-) (VP (VBD was) (NP (PRP itself)) (NP (NP (DT a) (NN gas) (CC and) (NN vanished)) (PP (IN into) (NP (DT the) (NN atmosphere))))))))))))) (. .)))
Wood also burned through addition of air to its substance, but it did not appear to gain weight, because the new substance formed (carbon dioxide) was itself a gas and vanished into the atmosphere.
(ROOT (S (NP (NNP Wood) (NNP burning)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (JJ different) (NN substance)) (VP (VBG being) (VP (VBN formed))))))) (. .)))