i8 



9. Flame of Endothermic Gases, acetylene and nitrous ox- 



ide. Exhibited by Charles A. Doremus. 



Acetylene C^H^ has an endothermic value of 61,100 

 colories. 



Nitrous oxide N^O an endothermic value of 18,470 

 colories. 



10. Collection of Specimens, Photographs, etc., illustrat- 



ing the production of Thomas slag, its conversion into 

 phosphatic fertilizer and effect on vegetation. Exhibited 

 from the Chemical Division of the Department of Agri- 

 culture, Washington, D. C, by Harvey W. Wiley. 



11. Crystalline Copper formed in electrolytic tanks. This 



formation was initiated by gases carried by the atmos- 

 phere from Newtown Creek to the copper works. Ex- 

 hibited by J. B. F. Herreshoff. 



12. New Assay Balance weighing to the -^-^ of a milligram. 



Exhibited by the College of the City of New York. 



13. Collection of Artistic Glass, showing application of 



scientific methods for the production of lustres, irides- 

 cences and mass color. Exhibited by Louis C. Tiffany, 

 Corresponding Member of the " Institut " (Academic des 

 Beaux Arts) . 



14. Collection of new Coloring Matters. Exhibited by 



Wm. J. Matheson Co., Ltd. 



a. Hemolin X. S.^ Patented. This is the pure coloring 

 matter of logwood presented in a dry, crystalline form, 

 of absolute purity and uniformity of brilliancy and 

 strength. This product will not melt as is usual with 

 Solid Logwood Extracts, and differs from them very ma- 

 terially. 



b. Morin Tell oiv^ Patented. This product is a pure color- 

 ing matter of Fustic presented in a dry, crystalline form, 

 and presents in its appearance and general properties the 

 same relation to Fustic as the above Hemolin, patented, 

 does to Logwood. 



