352 
Wisconsin Academy of Sciences , Arts and Letters. 
85 J. C. S.- 
Eberhardt, Arch. d. Pharm., Bd. 225, p. 515. 
87 Wallach speaks of “aus Wurmsamenol erhaltliehem cynen,” but 
he obtained this “ cynen ” with the aid of chemical reagents, by means 
of which cineol is converted into dipentene. The hydrocarbon occuring 
in these oils no doubt is dipentene, but the experimental proof is want¬ 
ing. Comp. e. g. E. Jahns, “Ueber das Eucalyptol.” Archiv d. Pharm . y 
Bd. 223, p. 52. 
38 Method of preparation, Annalen, Bd. 239, p. 3. 
69 Ibidem, Bd. 252, pp. 127 and 136. 
40 Ibidem, Bd. 227, p. 295., Comp. Diisoprene of Bouchardat. 
41 1 Comp. Wallach: “ Am. Terpentinol., Fichtennadelol, Wachholder- 
beerenol, Macisol, Salbeiol, Citronenol.” Annalen, Bd. 227, p. 277 et seq. 
2 (a.) That under certain conditions pinene will not form artificial 
camphor but dipentene dihydrochloride was first shown by Berthelot 
(1852.) Comp, historical sketch. Also Wallach, Annalen, Bd. 227, p. 286. 
(5.) The inversion of pinene into dipentene by means of sulphuric 
acid was studied by Armstrong and Tilden; Berichte, Bd. 12, p. 1754. 
Wallach, Annalen, Bd. 227, p. 283. 
3 Compare Terpinhydrate. 
42 1 Comp. Wallach: “ Pomeranzenschalenol, Fichtennadelol, Annalen, 
Bd. 227, p. 277. 
2 Comp, historical shetch, also Dissertation, p. 38. 
3 Comp. Disertation p. 46 9 . Hydrochloric acid acts like nitric acid: 
Annalen, Bd. 230, p. 266, Dissertation p. 45. 
43 Annalen, Bd 239, p. 44. 
45 Annalen. Bd. 239, p. 4. 
46 Annalen, Bd. 245. p. 196. 
47 Annalen, Bd. 230, p. 247 et. seq. 
Ad. Monhydrochlorides. • 
1 Journ. de Pharm., T. 26, p. 1. 
2 Ann. Chim. Phys., [3] T. 37. 
3 Compt. rend. T. 45, p. 904. 
4 Ibidem, T. 79, pp. 223 and 315. (J. C. S. Vol. 32, p. 1162.) 
5 Ibidem, T. 80, p. 1446. (J. C. S. Vol. 33, p. 1259.) 
6 Gazetta Chimica, T. 13, p. 99. (Berichte, Bd. 16, p. 1241. 
7 Compare e. g.: 
Himly (1835) Annalen, Bd. 29, p. 40. 
Schweizer, (1840) J. pr. Chem., Bd. 24, p. 257. 
8 Annalen, Bd. 239, p. 10. 
9 Ibidem, Bd. 241, p. 324. 
Ibidem, Bd. 245, pp. 241 et. seq. (p. 248, also pp. 258-260.) 
