Letter 44 No. 11: Particles in black material from chimney of a tin- or lead-furnace. Figuiren in swarte materie uijt de schoorsteen vande tin of loot oven.
Letter 44 No. 12: Salt particles in limestone. Soutfiguirtgens in steenkalk.
Letter 44 No. 13: Salt particles in shell-lime. Soutfiguirtgens in schulp kalk.