II. RESEARCH. 597 



lavender with hydrochloric acid, and distilling with water 

 vapour. No solid modification seems to exist. 

 Formula C 10 H 16 2 HC1. 



Dr. E. A. Letts and James Davidson. 



2515. Sulphide of Potassium, obtained by allowing a very 

 concentrated aqueous solution (prepared in the usual way) to 

 remain at rest for some time. Sulphide of potassium is usually 

 stated to be red and uncrystallizable from water. 



Dr. E. A. Letts. 



2516. Mono-sodium Glycerine, obtained by mixing glycerine 

 with an alcoholic solution of ethylate of sodium. It contains a 

 molecule of alcohol (acting as water of crystallization), which it 

 loses at 100 C. 



(See Berichte der deutschen chemischen Gesellschaft, 1872.) 

 Formula C 3 H 5 (OH) a (ONa) + C 2 H 6 O. 



Dr. E. A. Letts. 



2517. Crystallized Fyro-sulphuric Acid, obtained by 

 adding the equivalent quantity of sulphuric anhydride to oil of 

 vitriol. 



Formula II 2 S 2 O 7 



Dr. E. A. Letts. 



2518. Pure Oxalate of Methyl, used for the preparation 

 of pure methyl alcohol. 



COOCH 3 

 Formula 



COOCH 3 

 Dr. E. A. Letts and R. M. Morrison. 



2519. Pure Methyl Alcohol, obtained by the action of 

 boiling water on the oxalate of methyl, and subsequent dehydra- 

 tion with lime and sodium. 



Formula H CH 2 OH 



Dr. E. A. Letts and R. M. Morrison. 



COLLECTION OF PREPARATIONS RESULTING FROM TECHNICAL AND 

 SCIENTIFIC RESEARCH. CONTRIBUTED BY MEMBERS OF THE 

 GERMAN CHEMICAL SOCIETY. (The names of the members arc 

 given below their contributions). 



2677. 



1. Anthracene. 8. Aniline. 



2. Anthraquinone. 9. Hydroch] orate of Safrauiue. 



3. Dinitrobenzeue. 10. Hofmann's Violet (Iodine 



4. Eosine potassium. Violet). 



5. Methyl Violet. 11. Toluene. 



6. Rubin (Rosamlinchlorhydrate). 12. Coralline (Amraonium-rosolate). 



7. Beuzylchloride. 13. Nitrobenzene. 



