113 



HYDROCYANIC ACID IN PLANTS. 



Part iii. 



By Jamjjs M. Petrie, D.Sc, F.T.C, Linnean Macleay Fellow 

 OF THE Society in Biochemistry. 



(From the Physiological Laboratory of tlip University of Sydiipy.) 



Some new cyanogenetic Plants. 



The names of the plants included in this paper are additional 

 to those tabulated in Parts i. and ii. of this subject (see these 

 Proceedings, xxxvii., 1912, 220; and xxxviii., 1913, 624). 



The following plants gave positive reactions for hydrocyanic 

 acid when tested with sodium picrate paper in chloroform vapour; 

 and the reactions were afterwards confirmed by the prussian blue 

 test. 



(Native) Alocasia macrorrhiza Schott. 



Cardamine dictyosjwrma Hook. 

 Dysjjhania littoralis R.Br.* 

 Jnncus p7'is7natoca7'2)us R.Br. 

 Heterodendi^on olecefolia Desf. 

 (Introd.) Alocasia macrorrhiza var. variegata (Nich., Diet, of 

 Gard.). 

 Alocasia augustiana Lindl. and Rod. 

 Alocasia Sa7ideria7ia (Bailey's Cyclop, of Amer. Hort.). 

 Alocasia interm^edia (sp. unconfirmed). 

 Alocasia sj:)ectabilis (sp. unconfirmed). 

 Passijiora alba Link and Otto. 

 Tacsonia mixta Juss. 

 The following is a brief account of some experiments on the 

 Alocasias : — 



* Smith and White, of Brisbane, obtained hydrocyanic acid from D. 

 Tnyriocephala Benth., which is probably the same plant (Queensl. Agric. 

 Gaz., 191.5, 264). 



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