Cockayne. — Note on Gaya in Netv Zealaiul. 359 



33. Kirk, T. : "The Forest Flora of New Zealand" Wel- 

 lington; 1889. 



34. " The Students' Flora of New Zealnnd." 1899. 



34a. " The Displacement of Species in New Zealand." 



Trans. N.Z. Inst., vol. xxviii, p. 1 ; 1896. 



35. LiinL'. R. M., and Blackwel). E. W. : " Plants of New Zea- 



land." 1906. 



36. Marshall, P. : " The Geography of New Zealand." 



37. Petrie, D. : " List of the Flowering Plants indigenous to 



' Obago." Trans. N.Z. Inst., vol. xxviii, p. 540 ; 1896. 



38. " A Visit to Stewart Island, and Notes on its Flora." 



Trans. N.Z. Tnst., vol. xiii, p. 323 : 1881. 



39. Rutland, J. : " The Fall of the Leaf." Trans. N.Z. Inst., 



vol. xxi, p. 110; 1889. 



40. Schenck. H. : " Vergleichende Darstellung der Pfianzen- 



geographie der subantarctischen Inseln insbesondere iiber 

 Flora und Vegetation von Kerguelon." Jena ; 1905. 



41. Schimper, A. F. W. : "Plant-Geography" (English Trans- 



lation). Oxford; 1903. 



42. Skottsberg, C. : " Some Remarks upon the Geographical 



Distribution of Vegetation in the Colder Southern Hemi- 

 sphere." Ur Ymer ; 1905. 



43. Thomson, G. M. : " Plant-acclimatisation in New Zealand." 



Trans. N.Z. Inst., vol. xxxiii, p. 313 ; 1901. 



44. Warming, E. : " Lehrbuch der okologischen Pfiangengeo- 



graphie." Zweite Auflage der Deutschen Ausgabe ; 

 Berlin; 1902. 



Art. XXXI. — Supplementary Note on the Defoliation of Gaya in 

 New Zealand. 



By L. Cockayne, Ph.D. 



[Bead before the Philosophical Insiiinte of ('antcrburi/, I4th November, 



180B.] 



In the " Transactions of the New Zealand Institute " for 1904 I 

 published a note to the effect that Gaya lyallii var. ribifolia, 

 growing at an altitude of less than 3,000 ft., was in its natural 

 habitat a deciduous tree, notwithstanding the general opinion 

 to the contrary. I also suggested that, in all probability, Gaya 

 lyallii (the western plant) was also deciduous at all altitudes. 

 Previously to this, it had been looked upon as a fact that the 

 New Zealand forms of Gaya were evergreen at below 3,000 ft. and 

 deciduous at above that altitude — a very remarkable biological 

 fact indeed, if true. Even in the recently published " Manua 



