489.3 Barend COENDERS van HELPEN. Thresor de la philosophie des anciens où l'on conduit le lecteur par degrez à la connoissance de tous les metaux et mineraux et de la manière de les travailler & de s'en servir, pour arriver en fin à la perfection du grand oeuvre. En forme de dialogues... 2° Cologne: chez Claude le Jeune 1693 Ferguson Nat Union Cat Wisconsin [Illustrations:- 18 engravings. 1. Frontispiece. 286x183mm. 2. Inserted before p1. 287x180mm. "Alchimia." 3. Inserted after p8. 180x100mm. Series of geometric diagrams, deconstucting the word "DEUS". 4. Inserted after p10. 178x94mm. Various geometrical diagrams, with the word 'DEUS' in large letters below. 5. Inserted after p22. 264x178mm. A cross made up of 24 divisions, the horizontal have 6 measures and the vertical 18. To the left a deconstructed cube is shown to be composed of 6 squares totalling 24 sides. The plate is headed 'Deus Jesus Maria'. 6. Inserted after p24. 236x180mm. In the upper part the six squares of item 5 are arranged to form a hexagon. In the lower section, this hexagon and squares is developed further by constructing another layer. 7. Inserted after item 6. 168x142mm. Thirteen cubes form a stack. 8. Inserted before p29. 290x183mm. "Chaos." 9. Inserted before p37. 288x181mm. "Calor." 10. Inserted after p88. 286x183mm. "Amor." 11. Inserted before p127. 292x183mm. "Ignis." 12. Inserted after p140. 294x183mm. "Ignis Philosophorum." 13. Inserted before p159. 289x183mm. "Aer." 14. Inserted before p169. 286x181mm. "Aqua." 15. Inserted before p177. 291x183mm. "Terra." 16. Inserted before p191. 292x183mm. "Sulphur." 17. Inserted before p199. 291x181mm. "Mercurius." 18. Inserted before p205. 291x183mm. "Sal."]