262 BIBLIOGRAPHY 



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Botariiker iiber die Ursachen der schonen Herbstfartnmg 

 der Baumvegetation im nordlichen Amerika,' Arch. Natg., 

 Berlin, 1863, xxix, pp. 261-266. 



Relation between geographical position and intensity 

 of autumnal coloration. 



271. 1865. Sachs, J., 'Wirkung des Lichts auf die Bliithenbildung 



unter Vermittlung der Laubblatter,' Bot. Ztg., Leipzig, 

 1865, xxin, pp. 117-121, 125-131, 133-139. 



Experiments on the effect on development and colora- 

 tion of flowers of darkening certain shoots only, the re- 

 mainder of the plant being in the light. pp. 5, 85 



272. 1868. *Hallier, E., Phytopathologie, Die Krankheiten der 



Culturgewdchse, Leipzig, 1868, p. 101. 



Anthocyariin in roots of Salix. p. 89 



273. 1870. *Weretennikow, J., Arbeiten der St. Petersburger Gesell- 



schaft der Naturforscher, 1870, i (1), p. 57. 



Reddening of seedlings of Polygon/urn and other plants is 

 entirely absent in the dark. p. 89 



274. 1871. Collation, D., 'Effets de la foudre sur les arbres et les 



plantes ligneuses.' Mem. Soc. Phys., Geneve. 1871-1872, 

 xxi, pp. 501-584. 



Injury brought about by lightning may act like 

 artificial ringing, and cause leaves above point of injury 

 to turn red. 



275. Wiesner, J., 'TJntersuchungen iiber die herbstliche 

 Entlaubung der Holzgewachse,' SitzBer. Ak. Wiss., Wien, 

 1871, LXIV (1), pp. 465-510. 



Paper includes a short account of autumnal coloration 

 and various causes and conditions connected with it. 

 Greater acidity noted in autumnal leaves. 



276. 1872. Kraus, C., 'Weitere Mittheilungen iiber die winterliche 



Farbung immergriiner Gewachse,' SitzBer. physik. Soc., 

 Erlangen, 1872, Heft 4, pp. 62-65. 



Low temperature is the most important factor in antho- 

 cyanin production. 



277. 1873. *Kraus, C., 'Studien iiber die Herbstfarbung der 



Blatter und iiber Bildungsweise der Pflanzensauren,' 

 Buchner's Neues Repertorium fur Pharmacie. Miincheri. 

 1873, xxn, p. 273. 



View that production of anthocyanin is augmented by 

 acidity of cell-sap 



278. Rafarin, 'Coloration des feuilles a 1'automne,' Rev. 

 hortic., Paris, 1873, pp. 50-51. 



Red and yellow autumn pigments exist in a latent state 

 in the green leaves. 



