Watercolour on paper of 'Lilium flo: albo' from 'Verzameling van Bloemen naar de Natuur geteekend door' ( Collection of flowers drawn from nature by) Pieter van Kouwenhoorn, dating from the c.1630's this leather bound album contains 46 paintings probably prepared for publication as many plant names are given in Latin, French and German . Kouwenhoorn was a glass painter working in Haarlem and Leiden in the Netherlands, he was one of the masters of the painter Gerard Dou ( 1613-1675)