BLOK, PETRUS JOHANNES (1855-1932), Dutch his torian, was born Jan. to, 1855 at Helder, Holland. After holding a professorship in Groningen university, he became, in 1894, pro fessor of Dutch history in the University of Leyden, a position which he retained until 1925. His most important work is Geschi edenis van het Nederlandsche V olk (History of the Dutch People) (1892). Among his other historical books are Eene Hollandsche Stad in de Middeleeuwen (A Dutch Town in the Middle Ages) 0882); Willem de Eerste Prins Van Oranje (Prince William the First) (Ioto–tg2o).