List of Flutes. xiii 



Plate VI. 

 Fiii. o. Lcad-rufiniuLi- furnace at the Gerniauia Works. Utah. 



Plate VII. 



Fig. 6. Steitz's siphon-tap, for the polling-pots. 



7. Polling- rutch, or wood-holder, for the polling-pot. 



Plate VIll. 

 Fig. 8. Brodie's distillation furnace. 



Plate IX. 



Fig. 9. Furnace at Cheltenham, Missouri. 



10. Steitz's siphon-tap for the distillation-furnace. 



Plate X. 



Fig. 11. Improved retort-furnace i,"tilting-furnace"; by Fabcr 

 du Faur, C E. 



Plate XI. 

 Fig. 12. Details of Faber du Faur's furnace. 



Plate XII. 



Fig. 13. Furnace planned by Faber du Faur for the Germania 

 Works, Utah. 



Plate XIII. 



Fig. 14. Larger tilting furnace, for tiame or gas, by Faber du 

 Faur. 



Plate XIV. 



Relations of Spirifer Jams, Hall, to other species of the genus. Art. X, 

 pp. 140—161. 



