III. SPECIAL COLLECTIONS. 



Phosphenylchloride C 6 H 5 PC1 2 . 

 Phosphenyltetrachloride C 6 H 5 PC1 4 . 

 Phosphenylchlorobromide 



C 6 H 5 PCl 2 Br 2 . 

 Phospheny Ichlorote trabromide 



C 6 H 5 PCl 2 Br 4 . 

 Phospheuyloxychloride C 6 H 5 PC1 2 O. 



Phosphenylic acid C 6 H 5 PO(OH) 



Calcium- phosphenylate 



le C 6 H 5 P( 

 H 5 PO(OE 



Phosphenylous acid 



Trichlortolylphosphinic acid 



C 6 H 5 PO(0 2 Ca). 

 C 6 H 5 PO(OH)H. 



[ 4 CC1 3 PO(OH) 2 . 



Diethylphenylphosphiue 



C 6 H 5 (C 2 H 5 ) 2 P. 



Monophenylphosphoric cliloride 



POC1 2 (OC 6 H 5 ). 



Diphenylphosphoric chloride 



Monopheoylphosphoric acid 



POC1(OC 6 H 5 ),. 



PO(OC 6 H 5 )(OH) 2 . 



Phosphorchlorotetrabromide 

 Amidophosphenylic acid 



PCl 3 Br 4 . 



Nitrophosphenylic acid 



C 6 H 4 (NH 2 )PO(OH) 2 . 



C 6 H 4 (N0 2 )PO(OH) 2 . 



Carlsruhe, Chemical Laboi'atory of the Polytechnic Aca- 

 demy ; Prof. A. Michaelis. 



1. Chlorbromacetic acid. 



2. Chloral-cyanide-cyanate. 



3. Chloral-anilide. 



Dr. C. V. Cech, Berlin. 



1. Tripheuylbenzeue "I 



2. Triphenylbenzene > different crystallisations. 



3. Triphenylbenzene J 



4. Sulphide of benzophenone. 



5. Triphenylic ether. 



6. Crystallized Pinakon of the Acetophenone. 



Prof. Engler, Halle. 



Benzoic acid sublimed from urine. Fine crystals with scarcely any smell ; 

 possessing a pure white colour. 



Furtenbach and Oelhafen, in Reichelsdorf near Nuremberg. 



{OH 

 ONH 4 r ^is compound, hitherto found in the 



working apparatus of gas manufactories where the apparatus has the tem- 

 perature of the surrounding air, is interesting on account of its having been 

 observed in the gas-discharge pipes of hydraulic machines. The pipes have 

 a temperature of 50 C. and upwards, at which temperature carbonate of 

 ammonia for the most part dissociates into its components. No iodine was 

 found in the compound ; the dark colour was owing to coal-dust. 



Oxalic acid from lighting gas, C 2 O 1 H 2 ,2H 2 O, obtained by treating larger 

 quantities of coal-gas with fuming nitric acid, after having withdrawn from the 

 gas the vapours of hydrocarbons by means of intense cold. 



Oils from lighting gas from Silesian coals obtained in very small quantity 

 by exposure of large quantities of lighting gas to the intense cold of 21 R. 



Gaswerke Stadtische, Berlin (Dr. Tieftrunk). 



1. Stannous chloride, Tin salt, SnCl 2 + 2H 2 O chemically pure, contains 52 

 per cent, of Sn. 



2. Stannic chloride, SiiCl 4 + 5H 2 O, contains 43 per cent, of ISn. 



3. Sodium-stannate contains 42 - -44 per cent, of Stannic oxide in soluble 

 form, Na2SnO3 + 2H 2 O. 



Th. Goldschntidt, Berlin. 



