GUMS, RESINS, AND OTHER VEGETABLE EXUDATIONS. 195 



For a brief examination of this kino, collected by the Horn 

 Exploring Expedition, see (62). Kino in this genus is rare, and 

 the reference to the gum (kino) of C. equisetifolia (Pharma- 

 cographica indica, 375) will be useful. 



Gramine^:. 

 Triodia pungens, R. Br. 



For an examination of this grass, collected by the Horn 



Exploring Expedition, see (62). See also my paper on Spinifex 



Resin (52). 



"Samples of resinous matter from roots of Spinifex and tunnels 

 made by ants, found here for the first time lying on the surface 

 of the sandy ground between the bunches of Spinifex, apparently 

 made of sand cemented with some agglutinous secretion of the 

 insect, or what is more probably the resinous substance found at 

 the roots of the Spinifex plant.' 7 [VV. T. Tietkens' Exploration of 

 West Central Australia, in Trans. R.G.S. (Vict.), viii. 35]. 



Cycade^:. 

 Macrozamia spp. 



My experiments and subsequent observations tend to show that 



the gums of all members of this genus are identical in character. 



See (43). 



I note that the gum of M. Denisoni was exhibited in the 

 N.S.W. Court, Paris Exhibition, 1867. 



Conifers. 

 Agathis australis, Salisb. (Syn. Dammara austmlis, Lamb ) 



The chewing of the fresh gum-resin of the Kauri Pine by the 

 New Zealanders explains the error made by Forster (from 

 Crozet, Voyage de HI. Marion), who had named the Mangrove 

 (Avicennia officinalis) A. resinifera, believing that the gum chewed 

 "by the natives had been obtained from that tree. The error is 

 repeated by Lindley, Vegetable Kingdom, p. 665 (Colenso, in 

 Trans. N.Z. Inst., Vol i., Essay on the Botany of the North Id. 

 o/N.Z., p. 56). 



For an analysis of the New Zealand Kauri "gum," see 

 Rennie (70). 



