610 



SEC. 13. CHEMISTRY. 



These specimens show the various stages in the preparation of potash from 

 the mineral salts. 



Vorster and Grunebery, Kalk b. Coin. 



Phenoquinone C 1S H 14 O 4 . 

 Pyrogalloquinone C 18 H 14 O 8 . 

 Purpurogallin C 1S H U O 9 . 

 Triacetamide C 6 H 9 O 3 N. 

 Bicyannaphtalene C 12 H 6 N 2 . 



Bioxynaphtalene C 10 H 8 2 . 

 Picric acid Bromonaphtalene 



C G H 2 (N0 2 ) 3 OIiC 10 H 7 Br. 

 Binitronaphtalene C 10 H 6 N 2 O 4 . 



Prof. Wichclhaus, Berlin. 



1. Bars of nickel; 2, bars of cobalt. These metal bars are about 170mm. 

 long and 42mm. broad and brightly polished. They form the first cast 

 pieces of cobalt and nickel of a large size which have ever been produced, 

 and date from the year 1866. W. Hankel made use of the same in his 

 investigations on the magnetic bearing of nickel and cobalt. (Berichte 

 der Konigl. Sachsi.schen Gesellschaft der Wissenschaften, mathematisch- 

 physikalische Klasse. Meeting of the 21st July 1875.) 



Prof. Winkler. Freiberg, Saxony. 



2536a. Chemical Preparations (61) from the works of 

 Engelhardt, Latschinow, Wolkow, Maikupar. Produced in the 

 Laboratory of the Agricultural Institute of St. Petersburg. 



Chemical Society of Russia, University of St. Petersburg. 



COLLECTION OF RUSSIAN CHEMICALS. 



9. 

 10. 

 11. 

 12 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 27, 



a Naphtol. 



ft Naphtol. 



a Naphty [sulphuric chloride. 



ft Naphtylsulphuric chloride. 



a Benzoylnaphtol. 



ft Benzoylnaphtol. 



Maikopar. 



Mononitrochlorbenzol. 

 Binitrochlorbenzol. 

 ft Cresotinic acid. 

 7 Cresotinic acid. 

 7 Ethyl-cresol. 

 a Benzoyl-cresol. 

 7 Benzoyl-cresol. 

 Potassium - a cresylsulphate. 

 Potassium -7 cresylsulphate. 

 Barium - 7 cresylsulphite. 

 Potassium -a cresylsulphite. 

 Barium - a cresylsulphite. 

 Barium-sulphocresylate. 

 Potassium-bisulphocresylate . 

 ft Benzokresid, C 7 H 7 O(C 7 H 5 O). 

 Potassium - o thymolsulpnate. 

 Barium - a thymolsulphate. 

 Phosphate of thymol. 

 Potassium -ft thymolsulphate. 

 Potassium-thiobenzoate. 

 Barium-thiobenzoate. 



28. Thiobeuzoic-ethylic-ether. 



29. Thiobenzoic-amy He-ether. 



30. Thiobenzoic anhydride. 



31. Dithiobenzoate of silver. 



32. Tetrachlorbenzol. 



33. Benzoylbisulphide. 



34. Binitrophenol. 



35. Picrylchloride. 



36. Picrotoluid. 



37. Binitrophenyltoluid. 



38. Propylenbromide. 



Engelhardt and Latschinoff. 



39. Toluidinsulphuric acid, 



acid, 

 Malyscheff. 



40. Toluidinsulphuric 



C 7 H 9 NS0 3 + H 2 



fC 7 H 7 S0 2 m. 



41. NJC 7 H 5 0. 



fC 7 H 7 S0 2 p. 



42. NJC 7 H 5 0. 



43. a Cresol. 



44. a Metlrrl-cresol. 



46. ft Cresol. 



47. ft Ethyle-cresol. 



48. Cresol-phosphate. 



