I.-~RESEARCH. 491 



XVI. 



Nitroalizarin C 14 H 7 (NO 2 )O 4 =C 6 H 4 { } C 6 H(NO 2 )(OH) 2 . 

 Amidoalizarin C 14 H 7 (NH 2 )O 4 =C 6 H 4 { g }c 6 H(NH 2 )(OH) 2 . 



XVII. 



Anthrapurpurin C 14 H S O 5 = C 6 H 3 (OH) 



Triacetylanthrapurpurin C2oH 14 O 8 = C 6 H 3 (() Ac) C 6 H 2 (OAc) 2 . 



XVIII. 



Anthraflavic acid = C 14 H 8 O 4 = C 6 H 3 (OH) { } C 6 H 3 (OH). 



Baric anthraflavate 2C 14 H 6 Ba0 4 , 3H 2 O. 



Diacetoanthraflavic acid = C 18 H 12 O 6 = C 6 H 3 (OAc) |^ 1 C 6 H 3 (OAc). 



XIX. 



New isomer of alizarin yielding anthrapurpurin on fusion with potassic 

 hydrate C 14 H 8 O 4 . 



XX. 



Crystallized glyoxylic acid obtained from dibromacetic acid C 2 H 4 4 = 

 CO(OH) 



J-TT/OH 



IOH- 



Calcic glyoxylate C 4 H 6 Ca"O 4 . 



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. 



2536b. Preparations from Acids (8), by Lokolow and 

 Latschinow (from acids). 



Chemical Laboratory of the Agricultural Institute of St. 

 Petersburg. 



2536c. Chemical Preparations (80) from the works of 

 Rutlerow, Menschutkin, Gustavson, Lwow, Wazne, Wyschne- 

 gradsky, Jernialajew, Popow, Prianichnikow, Nakapetian, Ta- 

 garin. Chemical Laboratory, University of St. Petersburg. 



2536d. Original Chemical Preparations (38), by Von C. 



Claus, obtained in his researches on Platina. 



Chemical Laboratory, Imperial Berg- Institute, St. Peters- 

 burg. 



2536e. Chemical Preparations (3), by L. Chishkow, ob- 

 tained in his researches on Fulminating Mercury. 



Chemical Laboratory, Michailow Artillery Academy. 



