xl HISTORY OF BOTANICAL DISCOVERY. 
INTRODUCED PLANTS. 
Hon. G. M. Thomson has summarized what is known on naturalized 
plants in New Zealand in his work on the “ Naturalization of Animals and 
Plants in New Zealand,” published in 1922. 
Some interesting information regarding the spread of introduced plants 
is given in “ Tutira”’ by Mr. H. Guthrie-Smith, while Dr. H. H. Allan has 
recorded the establishment of Spartina grass (N.Z. Jour. Sci. & Tech., 
vol. 6). 
CHEMISTRY OF THE NEW ZEALAND FLORA. 
A certain amount of investigation has been carried out in the chemistry 
of native plants. Mr. B. C. Aston has studied various tans, dyestufts, oils, 
alkaloids, and poisonous properties, including the dyes obtained from 
Coprosma, the oil of Tetrapathaea, and the alkaloids of the pukatea. 
Professor T. H. Hasterfield and his collaborators have investigated the 
genus Podocarpus ; Mr. Roy Gardner has written a general account and 
studied the essential oil of Leptospermum ; Mr. Goudie has described the 
essential oils of Libocedrus and Dacrydium; Mr. Perkin, the colouring- 
matter of the puriri; and Messrs. W. F. Short and C. W. Johnson, the 
essential oil of Leptospermum. 
