20 



acid potassium tartrate, " cream of tartar." Also un- 

 usual crystals of tartaric acid. 



Exhibited by Wm. McMurtrie. 



The above is an example of present methods in chem- 

 ical manufacture where great pvirity is attained through 

 working on a large scale. 



i6. Unusually Large and Handsome Crystals of Hydro- 

 chlorate OF Cocaine and of the alkaloid cocaine. 

 Exhibited by Wm. Jay Schieffelin. 



17. Trillot Apparatus for preparing gaseous formaldehyde 



for disinfection. 



18. Antivenomous Serum of Dr. Calmette. 



Antidote to snake bites. 



19. Autosprays for the application of medicinal and chemical 



substances. 



20. Rhodinol or artificial oil of rose. 



21. Large Crystals of Vanilline or artificial vanilla. 



Nos. 17, 18, 19, 20 and 21 are exhibited by Harold H. 

 Fries. 



22. New Specimen Bottle. 



23. Apparatus for Evolution of Gases. 



Nos. 22 and 23 are exhibited by Peter T. Austen. 



24. Method of Collecting and Analyzing the Gases in 



Canned Goods. Exhibited by Charles A. Doremus. 



25. Electric-centrifugal made in college mechanical shop 



by Charles E. Dressier. Exhibited by The College of 

 the City of New York. 



26. Solutions of Cellulose and commercial products there- 



from as fibres for incandescent electric lamps and films. 

 Exhibited by Dui-and Woodman. 



