[462] There are many kinds of lemon as well as of orange which are never seen in commerce. Risso and Poiteau enumerate 25 varieties of the former and 30 of the latter. See also Alfonso, Coltivazione degli Agrumi, Palermo, 2nd edition, 1875.
[463] Stoddart, in Pharm. Journ. x. (1869) 203.
[464] R. Warington, Pharm. Journ. v. (1875) 385.
[465] Berichte der Deutschen Chemischen Gesellschaft (1876) 26, 685, 693.
[466] Gazetta Chimica Italiana, ii. (1872) 385; Journ. of Chem. Soc. xi (1873) 402.
[467] Stoddart’s statement that if potash be added to lemon juice, oxalic acid may be detected in the mixture after a few days, is not supported by our observations.
[468] Magiæ Naturalis libri xx. Neapoli. 1589. 188.
[469] Through the kindness of Signor Mallandrino of Giampilieri near Messina, I had the pleasure of seeing how the essence is made. Though the time of my visit (13 May 1872) was not that of the manufacture, Signor M. sent for one of his workmen, and having procured a few lemons, set him to work on them in order that I might have ocular demonstration of the process.—D. H.
[470] For specimens of the Essence au zeste and of the Essence distillée of guaranteed purity we have to thank M. Médecin, distiller of essences, Mentone; and Messrs. G. Pannucio e figli, for an authentic sample of the essence made by the sponge process in their establishment at Reggio. We have also had a small quantity prepared by the écuelle by one of ourselves near Mentone, 15th June 1872.—D. H.
[471] Consul Dennis, On the Commerce, &c. of Sicily in 1869, 1870, 1871. Reports from H.M. Consuls. No. 4. 1873.