Gravar-mail: Studies in the biochemistry of micro-organisms: Fumigatin (3-hydroxy-4-methoxy-2:5-toluquinone), and spinulosin (3:6-dihydroxy-4-methoxy-2:5-toluquinone), metabolic products respectively of Aspergillus fumigatus Fresenius and Penicillium spinulosum Thom