See Drandar, Le Prince Alexandre de Battenberg en Bulgarie (Paris, 1884); Koch, Fiirst Alexander von Bulgarien (Darmstadt, 1887); Matveyev, Bulgarien nach dem Berliner Congress (Petersburg, 1887); Bourchier, "Prince Alexander of Battenberg," in Fortnightly Review, January 1894.
Koch has suggested that the disinfection of malarial persons by quinine would have the desired effect, but other authorities of greater experience do not consider it practicable.
Karl Koch considered that cultivated pears were the descendants of three species - P. persica (from which the bergamots have descended), P. elaeagrifolia and P. sinensis.
Xiii., 1892; Koch, C., Die Arachniden (16 vols., Nuremberg, 1831-1848); Koch, Keyserling and Sorensen, Die Arachniden Australiens (Nuremberg, 1871-1890); Pocock, Arachnida of British India (London, 1900); Idem, " On African Arachnida," in Proc. Zool.