Formerly a friend and disciple of Mazzini, with whom he had broken on the question of the monarchical form of government which Crispi believed indispensable to the unification of Italy, he had afterwards been one of Garibaldis most efficient coadjutors and an active member of the party of action.
After a night's sleep the news is as indispensable as the breakfast.
Tikhon Shcherbaty was one of the most indispensable men in their band.
Hence a good herbarium forms an indispensable part of a botanical museum or institution.
Perhaps it is even indispensable as a preliminary statement.