▁the ▁proposition " ▁of ▁the ▁composition ▁of ▁water ▁and ▁stated ▁that ▁the ▁methods ▁used ▁in ▁the ▁experiment ▁would ▁un ite ▁chem istry ▁with ▁the ▁other ▁physical ▁sciences ▁and ▁advance ▁discover ies . ▁ ▁Element ary ▁Tre at ise ▁of ▁Chem istry ▁ ▁Lav ois ier ▁employed ▁the ▁new ▁nom en cl ature ▁in ▁his ▁Tra ité ▁él ément aire ▁de ▁chim ie ▁( Element ary ▁Tre at ise ▁on ▁Chem istry ), ▁published ▁in ▁ 1 7 8 9 . ▁This ▁work ▁represents ▁the ▁synth esis ▁of ▁Lav ois ier ' s ▁contribution ▁to ▁chem istry ▁and ▁can ▁be ▁considered ▁the ▁first ▁modern ▁text book ▁on ▁the ▁subject . ▁The ▁core ▁of ▁the ▁work ▁was ▁the ▁o xygen ▁theory , ▁and ▁the ▁work ▁became ▁a ▁most ▁effective ▁vehicle ▁for ▁the ▁transmission ▁of ▁the ▁new ▁do ctr ines . ▁It ▁presented ▁a ▁un ified ▁view ▁of ▁new ▁theories ▁of ▁chem istry , ▁contained ▁a ▁clear ▁statement ▁of ▁the ▁law ▁of ▁conservation ▁of ▁mass , ▁and ▁denied ▁the ▁existence ▁of ▁ph log ist on . ▁This ▁text ▁clar ified ▁the ▁concept ▁of ▁an ▁element ▁as ▁a ▁subst ance ▁that ▁could ▁not ▁be ▁broken ▁down ▁by ▁any ▁known ▁method ▁of ▁chemical ▁analysis ▁and ▁presented ▁Lav ois ier ' s ▁theory ▁of ▁the ▁formation ▁of ▁chemical ▁comp ounds ▁from ▁elements . ▁It ▁remains ▁a ▁classic ▁in ▁the ▁history ▁of ▁science . ▁While ▁many ▁leading ▁chem ists ▁of ▁the ▁time ▁refused ▁to ▁accept ▁Lav ois ier ' s ▁new ▁ideas , ▁demand ▁for ▁Tra ité ▁él ément aire