The 17th century botanist William Coles supposed that God had made 'Herbes for the use of men, and hath given them particular Signatures, whereby a man may read ... the use of them.' Coles's "The Art of Simpling" and "Adam in Eden", stated that walnuts were good for curing head ailments because in his opinion, "they Have the perfect Signatures of the Head". Regarding "Hypericum", he wrote, "The little holes whereof the leaves of Saint Johns wort are full, doe resemble all the pores of the skin and therefore it is profitable for all hurts and wounds that can happen thereunto."