Sheaves of T-algebras

It must be known that if T is a left exact theory (same as nearly equational theory) and you make a sheaf of T-algebras (meaning the stalks are T-algebras, then the set of global sections is also a T-algebra. Can anyone give me reference? Michael -- The modern conservative is engaged in one of man's oldest exercises in moral philosophy--the search for a superior moral justification for selfishness. --J.K. Galbraith [For admin and other information see: http://www.mta.ca/~cat-dist/ ]