++++ 1 . AGRICULTURE - APPROXIMATION OF LAWS - LEGAL BASIS ( EEC TREATY, ARTS 38 ( 2 ), 39, 43 AND 100; COUNCIL DIRECTIVE 85/649 ) 2 . MEASURES ADOPTED BY THE INSTITUTIONS - CHOICE OF LEGAL BASIS - CRITERIA - PRACTICE FOLLOWED BY OF AN INSTITUTION - NOT RELEVANT IN THE LIGHT OF THE RULES LAID DOWN IN THE TREATY 3 . MEASURES ADOPTED BY THE INSTITUTIONS - PROCEDURE FOR ADOPTION - RULES LAID DOWN IN THE TREATY - IMPERATIVE 4 . ACTION FOR A DECLARATION THAT A MEASURE IS VOID - GROUNDS - INFRINGEMENT OF ESSENTIAL PROCEDURAL REQUIREMENTS - INFRINGEMENT OF A PROVISION OF THE COUNCIL' S RULES OF PROCEDURE GOVERNING VOTING PROCEDURES ( EEC TREATY, FIRST PARAGRAPH OF ART . 173; MERGER TREATY, ART . 5; RULES OF PROCEDURE OF THE COUNCIL, ART . 6 ( 1 ) )