New Zealand Institute Science Congress. 515 



The results included the discovery of a remarkable polymorphic new species of 

 gentian which exhibited different habits of growth according to the habitat. This 

 semi-arid district was well supplied with moist, dark stations in close proximity to 

 very dry, strongly isolated stations. The same species might grow on a dark, dripping 

 river-cliff, a shingle-bed exposed to a large measure of sunlight, a dry shady hillside, 

 or a rock-crevice. A Carmichaelia, which was probably C. Monroi, exhibited such a 

 variety of forms under these conditions that a botanist might class them as distinct 

 species if he did not know the conditions under which the specimens Mere growing. 

 The rediscovery was made of Wahlenbergia Matthewsii, the finest of the New Zealand 

 species of that genus, originally discovered by H. J. Matthews, and found to be common 

 in the Ure Valley as a rock-plant. Flowering specimens of Olearia coriacea were found 

 in the Mead Stream, a Haastia growing at 8,500 ft. elevation, and Helichysum Purdiei, 

 which, as Dr. Cockayne had pointed out, was probably a hybrid between H. bellidioides 

 and H. glomeratum, since H. Purdiei was always found in association with its reputed 

 parents. The speaker also described the rock associations met with. A Kotospartium 

 was found to be abundant in the Inland Kaikouras, and it was this plant which 

 Mr. Petrie was now naming N. glabrescens ; it attained a height of 15 ft. to 30 ft. 



" Inheritance in Self-fertilized Plants,'" by Dr. F. W. Hilgendorf. 



"Wellington Island Soils and Floralas," by B. C. Aston. 



Geology Section. 



Presidential Address : " The Birth and Development of New Zealand as a 

 Geographical Unit," by Professor J. Park. (This paper appears in 

 the present volume, pp. 73-76.) 



' The Cretaceous Piocks of the Kaipara District," b} T Dr. P. Marshall. 



Abstract. 

 Up to the present time very few fossils have been found in rocks of Upper Cretaceous 

 age in New Zealand. The author, however, gave a description of a rich series of 

 important fossils that he had recently found. These were largely ammonites, and 

 showed a great similarity to fossils of similar Cretaceous age in South India and 

 Antarctica. This recent discovery enforces the opinion previously held that New 

 Zealand was joined to Antarctica in late Cretaceous times, and that this land was not 

 distant from an Indian extension. 



' The Geology of Western Samoa," by Dr. J. Allan Thomson. (This paper 

 appears in the N.Z. Journal oj Science and Technology, vol. 4, 

 pp. 49-66, 1921.) 



' The Structure of the Mangahao No. 1 Gorge (Mangahao Hydro-electric 

 Scheme), and its Bearing on the Construction of the Proposed Dam," 

 by G. L. Adkin. (This paper appears in the N.Z. Journal of Science 

 and Technology, vol. 4, pp. 1-4, 1921.) 



"' The Warped Land-surface of the South-eastern Side of the Port Nichol- 

 son Depression," by Dr. C. A. Cotton. (This paper appears in the 

 present volume, pp. 131-43.) 



" The Great Barrier Island," by J. A. Bartrum. (This paper appears in 

 the present volume as " Notes on the Geology of Great Barrier Island, 

 New Zealand," pp. 115-27.) 



" The Geology of the Port Waikato District," by M. J. Gilbert, M.Sc. (Rev. 

 Brother Fergus). (This paper appears in the present volume as 

 " Geology of the Waikato Heads District and the Kawa Uncon- 

 formity," pp. 97-114.) 



" The Tertiary Geology of the Awamoho District," by G. H. Uttley. 



" A Ball and Pillow Lava from Hawaii," by Dr. J. Allan Thomson. 

 17* 



